WO2015129727A1 - Communication terminal, communication method and program - Google Patents

Communication terminal, communication method and program Download PDF

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Publication number
WO2015129727A1
WO2015129727A1 PCT/JP2015/055344 JP2015055344W WO2015129727A1 WO 2015129727 A1 WO2015129727 A1 WO 2015129727A1 JP 2015055344 W JP2015055344 W JP 2015055344W WO 2015129727 A1 WO2015129727 A1 WO 2015129727A1
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WIPO (PCT)
Prior art keywords
unit
communication
packet
name resolution
address
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PCT/JP2015/055344
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French (fr)
Japanese (ja)
Inventor
貴裕 飯星
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日本電気株式会社
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Priority to JP2016505250A priority Critical patent/JPWO2015129727A1/en
Publication of WO2015129727A1 publication Critical patent/WO2015129727A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

Definitions

  • the present invention is based on the priority claim of Japanese patent application: Japanese Patent Application No. 2014-034784 (filed on Feb. 26, 2014), the entire contents of which are incorporated herein by reference. Shall.
  • the present invention relates to a communication terminal, a communication method, and a program, and more particularly, to a communication terminal that can be connected to a plurality of networks, and a communication method and program applied to the communication terminal.
  • Non-Patent Documents 1 to 3 describe a standard called ANDSF (Access Network Discovery and Selection Function).
  • Non-Patent Documents 1 and 2 describe a policy description method for specifying communication traffic using an application name, a domain name, and the like, and distributing the traffic to these wireless interfaces, and operations expected for a communication terminal to which the policy is given. Is described.
  • Patent Literature 1 a domain name and a policy included in a DNS (Domain Name Service) query are collated, and a DNS query is transmitted to a DNS server associated with the radio interface using a radio interface specified in the policy.
  • DNS Domain Name Service
  • Non-Patent Document 4 describes Android, which is an operating system (OS: Operating System) for communication terminals.
  • OS Operating System
  • a DNS resolver for setting a DNS server address for each process identifier (PID: Process : ID) of an application is installed.
  • the DNS resolver performs the setting by storing the character string including the PID and the address of the DNS server in the setting database in association with each other.
  • the setting database stores the DNS server address associated with each wireless interface.
  • Non-Patent Documents 5 and 6 describe OpenFlow (OpenFlow) that realizes a centralized control network. OpenFlow captures communication as an end-to-end flow and performs path control, failure recovery, load balancing, and optimization on a per-flow basis.
  • the OpenFlow switch (OFS: OpenFlow Switch) specified in Non-Patent Document 6 has a secure channel (Secure Channel) for communication with the OpenFlow controller (OFC) and is added or rewritten as appropriate from the OFC. Operates according to the specified flow table (Flow Table).
  • the OFS searches the flow table for an entry having a matching condition (see “5.3 Matching” in Non-Patent Document 6) that matches the header information of the received packet.
  • the OFS updates the flow statistical information (counter) and processes the processing contents (from the designated port) described in the instruction field of the entry for the received packet. Packet transmission, flooding, discarding, etc.).
  • OFS requests entry setting to OFC via the secure channel, that is, a control information transmission request for processing the received packet. (Packet-In message) is transmitted.
  • the OFS receives the flow entry in which the processing content is defined and updates the flow table. As described above, the OFS performs packet transfer using the entry stored in the flow table as control information.
  • the server address is obtained by name resolution using DNS (Domain Name Service).
  • DNS Domain Name Service
  • the DNS query is also assigned to the wireless interface using the DNS query source application or the domain name included in the DNS query. If it is not transmitted to the associated DNS server, inconvenience may occur.
  • the DNS server associated with the wireless LAN can resolve the name.
  • the server name cannot be resolved.
  • name resolution is performed by the DNS server associated with LTE to When communication traffic is distributed to the wireless LAN, the communication traffic becomes unreachable.
  • the DNS query is sent to the DNS server associated with the radio interface. It is necessary to realize a communication terminal for transmission. However, in order to realize such a communication terminal, greatly changing the DNS resolver mounted on an existing communication terminal is problematic from the viewpoint of mounting cost.
  • An object of the present invention is to provide a communication terminal, a communication method, and a program that contribute to solving the problem.
  • a communication terminal holds a plurality of communication interfaces, a data transmission / reception unit that transmits / receives data to / from a destination device, an identifier of the data transmission / reception unit, and the data transmission / reception unit in association with each other Generating a packet that includes information indicating the destination device and the identifier acquired by the name resolution unit, and a name resolution unit that acquires the identifier of the data transfer unit with reference to the setting storage unit
  • a communication interface to be used is determined from among the plurality of communication interfaces, using a communication software basic unit to perform, information indicating the destination device included in the packet, an identifier of the data transfer unit, and a predetermined policy
  • a control unit that identifies an address of a name resolution server corresponding to the determined communication interface, and a destination address of the packet
  • a communication processing unit for sending the packet via the communication interface, wherein the control unit decides as to change the address of the name resolution server control section is specified.
  • a communication terminal including a plurality of communication interfaces and a data transmission / reception unit that transmits / receives data to / from a destination device.
  • a packet that includes information indicating the destination device and includes the acquired identifier, a step of associating and storing the information in the setting storage unit, a step of acquiring the identifier of the data transfer unit with reference to the setting storage unit And a step of determining a communication interface to be used from among the plurality of communication interfaces using information indicating the destination device included in the packet, an identifier of the data transfer unit, and a predetermined policy Specifying the address of the name resolution server corresponding to the determined communication interface, and specifying the destination address of the packet. With changing the address of the name resolution server, and a step of sending the packet via the communication interface to the determined.
  • a program provides a data exchange unit for a computer provided in a communication terminal including a plurality of communication interfaces and a data exchange unit that transmits and receives data to and from a destination device.
  • the program can
  • the communication interface specified in the policy is used based on the application name of the name resolution request source, the domain name included in the name resolution request data, and the communication interface. It is possible to realize a technique for transmitting name resolution request data to the name resolution server associated with the URL without changing the existing name resolution unit.
  • FIG. 1 is a diagram illustrating a configuration of a communication system including a communication terminal 1 according to an embodiment.
  • FIG. 2 is a block diagram illustrating the configuration of the communication terminal 1.
  • the communication terminal 1 includes a plurality of communication interfaces 11a and 11b, data transfer units 12a and 12b, a setting storage unit 16, a name resolution unit 17, a communication software basic unit 13, a control unit 14, and a communication process. Part 15 is provided.
  • the data transfer unit 12a transmits and receives data to and from the destination device (for example, the server 4a in FIG. 1).
  • the setting storage unit 16 holds the identifiers (for example, addresses) of the data transfer units 12a and 12b and the data transfer units 12a and 12b in association with each other.
  • the name resolution unit 17 refers to the setting storage unit 16 and acquires the identifier of the data transfer unit 12a based on the request of the data transfer unit 12a.
  • the communication software basic unit 13 generates a packet including information indicating the destination device and including the identifier acquired by the name resolution unit 17 (for example, as a destination address).
  • the control unit 14 uses the information indicating the destination device included in the packet, the identifier of the data transfer unit, and a predetermined policy to use a communication interface (for example, a plurality of communication interfaces 11a and 11b).
  • 11a) is determined, and the address of the name resolution server (for example, 5a) corresponding to the determined communication interface 11a is specified.
  • the communication processing unit 15 changes the destination address of the packet to the address of the name resolution server 5a specified by the control unit 14, and sends the packet through the communication interface 11a determined by the control unit 14.
  • the control unit 14 refers to the setting storage unit 16 to identify the data transmission / reception unit 12a to which the identifier included in the packet is attached, and information indicating the identified data transmission / reception unit 12a and the destination device included in the packet.
  • a communication interface to be used (for example, the communication interface 11a corresponding to the wireless network 2a) may be determined from the plurality of communication interfaces 11a and 11b by collating with a predetermined policy (for example, FIG. 4).
  • the predetermined policy may include a correspondence between information indicating the data transmission / reception unit and the destination device and a communication interface to be used.
  • the setting storage unit 16 holds each communication interface in association with the address of the corresponding name resolution server (for example, FIG. 6), and the control unit 14 stores the name resolution server 5a corresponding to the determined communication interface 11a.
  • the address may be specified based on the setting storage unit 16.
  • the communication interface specified in the policy based on the application name of the name resolution request source is used, and the corresponding communication interface is associated.
  • Name resolution request data can be transmitted to the designated name resolution server.
  • a communication terminal connects to a plurality of wireless networks via a wireless communication interface.
  • the present invention is not limited to the case where the communication terminal accesses a plurality of wireless networks, but also when the communication terminal connects to a plurality of wired networks or to connect to a plurality of networks composed of a wireless network and a wired network. Can be applied as well.
  • FIG. 1 is a diagram illustrating a configuration of a communication system including a communication terminal 1 according to the present embodiment.
  • the server 4 provides a predetermined service by transmitting and receiving packets to and from the communication terminal 1 of the present embodiment.
  • the contents of the service provided by the server 4 are not particularly limited.
  • FIG. 1 illustrates a case where the communication system includes two servers 4a and 4b. However, the number of servers 4 is not limited to two. In addition, when it is not necessary to distinguish the servers 4a and 4b, they are referred to as “server 4”.
  • the server 4 may be connected to the wired network 3. In the present embodiment, a case where the server 4 is connected to the wireless network 2 will be described.
  • FIG. 1 is a diagram illustrating a configuration of a communication system including a communication terminal 1 according to the present embodiment.
  • the server 4 provides a predetermined service by transmitting and receiving packets to and from the communication terminal 1 of the present embodiment.
  • the contents of the service provided by the server 4 are not particularly limited
  • FIG. 1 shows a case where the server 4a is connected to the wireless network 2a and the server 4b is connected to the wireless network 2b.
  • the address of the server 4a when communicating with the server 4a via the wireless network 2a is different from the address of the server 4a when communicating with the server 4a via the wired network 3.
  • the communication terminal 1 is connected to a plurality of wireless networks 2 wirelessly.
  • FIG. 1 illustrates a case where the communication terminal 1 is connected to two wireless networks 2a and 2b.
  • the number of the wireless networks 2 connected to the communication terminal 1 is not particularly limited.
  • the radio networks 2a and 2b are referred to as “radio network 2”.
  • the wireless network 2 is directly or indirectly connected to the wired network 3.
  • the server 4 is directly or indirectly connected to the wired network 3.
  • FIG. 1 illustrates a case where the communication system includes two name resolution servers 5a and 5b. However, the number of name resolution servers 5 is not particularly limited. When it is not necessary to distinguish between the name resolution servers 5a and 5b, the name resolution server 5 is described.
  • the name resolution server 5 may be connected to the wired network 3. In the present embodiment, a case where the name resolution server 5 is connected to the wireless network 2 will be described.
  • FIG. 1 shows a case where the name resolution server 5a is connected to the wireless network 2a and the name resolution server 5b is connected to the wireless network 2b.
  • the communication terminal 1 is, for example, a mobile phone, a smartphone, a tablet terminal, a personal computer (PC: Personal Computer), or the like. However, the communication terminal 1 is not limited to these examples.
  • the wireless network 2 is, for example, a wireless LAN, UTRAN (Universal Terrestrial Radio Access Network), E-UTRAN (Evolved Universal Terrestrial Radio Access Network), or the like.
  • the wireless network 2 may be a wireless network other than these.
  • the wired network 3 is, for example, the Internet. However, the wired network 3 is not limited to the Internet.
  • the server 4 is, for example, a Web server. However, the server 4 is not limited to a Web server.
  • the name resolution server 5 is, for example, a DNS (Domain Name Service) server. However, the name resolution server 5 is not limited to a DNS server.
  • FIG. 2 is a block diagram illustrating the configuration of the communication terminal 1 of the present embodiment.
  • the communication terminal 1 includes a plurality of communication interfaces 11, a data exchange unit 12, a communication software basic unit 13, a control unit 14, a communication processing unit 15, a setting storage unit 16, and a name resolution unit 17. ing.
  • the communication interface 11 is connected to the communication processing unit 15.
  • the communication software basic unit 13 is connected to the data transfer unit 12, the communication processing unit 15, and the control unit 14.
  • the control unit 14 is connected to the communication processing unit 15 and the setting storage unit 16. Note that the control unit 14 and the communication processing unit 15 may not be directly connected. For example, the control unit 14 and the communication processing unit 15 may be connected via the communication software basic unit 13. In the present embodiment, a case where the control unit 14 and the communication processing unit 15 are directly connected will be described.
  • the name resolution unit 17 is connected to the data transfer unit 12, the communication software basic unit 13, and the setting storage unit 16. The name resolution unit 17 and the data transfer unit 12 may not be directly connected. For example, the name resolution unit 17 and the data transfer unit 12 may be connected via the communication software basic unit 13.
  • the communication interface 11 communicates with the outside via the wireless network 2.
  • One communication interface 11 corresponds to at least one wireless network 2.
  • the communication interface 11 outputs the packet input from the communication processing unit 15 to the wireless network 2.
  • the communication interface 11 sends a packet input from the wireless network 2 to the communication processing unit 15.
  • the communication terminal 1 includes two communication interfaces 11a and 11b, the communication interface 11a corresponds to the wireless network 2a, and the communication interface 11b corresponds to the wireless network 2b.
  • the communication interfaces 11a and 11b are referred to as “communication interface 11”.
  • the communication terminal 1 may include three or more communication interfaces 11.
  • the communication interface 11 is, for example, a wireless LAN module or a wireless modem module. However, the communication interface 11 is not limited to these examples.
  • the data exchanging unit 12 designates a communication protocol and a destination in the communication software basic unit 13, and exchanges data with the communication software basic unit 13.
  • the communication software basic unit 13 generates a packet based on this data.
  • the communication terminal 1 exchanges data with the server 4 by transmitting and receiving packets to and from the server 4.
  • the data transfer unit 12 instructs the communication software basic unit 13 to perform connection processing for transmitting and receiving packets to and from the server 4.
  • the data transfer unit 12 inputs name resolution request data including the name of the server 4 to the name resolution unit 17 and receives name resolution response data including the address of the server 4.
  • the address of the server 4 is acquired.
  • the communication terminal 1 will be described as including two data transfer units 12a and 12b.
  • the data transfer unit 12a is described as “data transfer unit 12”.
  • the communication terminal 1 may include three or more data transfer units 12.
  • the data transfer unit 12 is realized by a CPU (Central Processing Unit) of a computer that operates according to a program such as a Web browser, for example.
  • the communication terminal 1 may include a program storage device (not shown) that stores a program, and the CPU may read the program from the program storage device and operate as the data transfer unit 12 according to the program.
  • the program that causes the CPU to realize the function as the data transfer unit 12 is not limited to the Web browser, and may be another program.
  • the communication software basic unit 13 generates a packet based on the data input from the data transfer unit 12. In addition, when receiving the packet received from the server 4, the communication software basic unit 13 extracts data from the packet and sends it to the data transfer unit 12.
  • the communication software basic unit 13 When the communication software basic unit 13 receives data from the data sending / receiving unit 12, the communication software basic unit 13 determines a source address according to a communication transfer rule preset in the communication software basic unit 13. Further, the communication software basic unit 13 generates a packet including the transmission source address and the transmission destination address designated by the data transmission / reception unit 12 in the header based on the data input from the data transmission / reception unit 12. The communication software basic unit 13 sends the generated packet to the communication processing unit 15 according to the communication transfer rule. In the present embodiment, it is assumed that the default setting of the communication transfer rule specifies that the communication software basic unit 13 sends the generated packet to the communication processing unit 15.
  • the communication software basic unit 13 when the data transfer unit 12 instructs the communication software basic unit 13 to perform a connection process for transmitting / receiving a packet to / from the server 4, the communication software basic unit 13 includes a packet including the above-described transmission source address and transmission destination address in the header. The data is transmitted to the server 4 via the communication processing unit 15. The communication software basic unit 13 realizes a procedure for connection with the server 4 by transmitting this packet.
  • the communication software basic unit 13 is realized, for example, by a CPU of a computer that operates according to a TCP (Transmission Control Protocol) / IP (Internet Protocol) stack implemented in an operating system (OS) kernel.
  • the CPU may read a program (in the above example, a TCP / IP stack) from a program storage device (not shown) and operate as the communication software basic unit 13 according to the program.
  • the communication transfer rule set in the communication software basic unit 13 is, for example, IP routing setting. Further, as a protocol that requires connection processing with a destination, for example, TCP can be mentioned, but a protocol other than TCP may be used.
  • the control unit 14 sets a value having a one-to-one correspondence with each of the data transfer units 12 in the setting storage unit 16 and having an address form (for example, the same format as the address).
  • the control unit 14 uses the destination address and the name resolution request data included in the name resolution packet including the name resolution request data by the name resolution unit 17, and the requested data exchange unit 12 and the requested server. Specify the name of 4.
  • the control unit 14 collates the name and policy of the specified data transfer unit 12 and server 4, uses the communication interface 11 specified in the policy, and sends a name resolution request to the name resolution server associated with the communication interface 11. Decide to send data.
  • the control unit 14 stores the values A and B having the address form in the setting storage unit 16 in a one-to-one correspondence with the data transfer units 12a and 12b, for example.
  • FIG. 3 illustrates a table stored in the setting storage unit 16. This embodiment will be described using this example.
  • the values A and B do not have to match the address of the name resolution server 5, and may be, for example, fictitious addresses, but are values sent from the communication software basic unit 13 to the communication processing unit 15. .
  • the control unit 14 associates the data transmission / reception unit 12 with a value having an address form and stores it in the setting storage unit 16, the identifier of the data transmission / reception unit 12 and a value having an address form may be stored.
  • the identifier of the data exchange unit 12 is, for example, a process identifier (PID: Process Identifier), a user identifier (UID: User Identifier), a group identifier (GID: Group Identifier), a name, or the like.
  • PID Process Identifier
  • UID User Identifier
  • GID Group Identifier
  • the identifier of the data transfer unit 12 is not limited to these examples.
  • the control unit 14 monitors the activation of the data exchange unit 12, and every time the data exchange unit 12 is activated, A value having the identifier and address form of the sending / receiving unit 12 is stored in the setting storage unit 16.
  • the control unit 14 determines communication processing for the packet.
  • determining communication processing specifically means determining a functional block in the communication terminal 1 that is a packet destination, a packet header field to be rewritten, and a packet header value. To do.
  • the control unit 14 stores at least a policy for designating a data transfer unit, a server name, and a wireless network used in an internal storage area.
  • FIG. 4 illustrates a policy in the present embodiment.
  • a policy using the wireless network 2a for communication addressed to the server 4a by the data transfer unit 12a (referred to as "policy 1") and a communication addressed to the server 4b by the data transfer unit 12b.
  • the policy that uses the wireless network 2b (referred to as "policy 2”) is included.
  • a priority may be set for each policy. In the present embodiment, a case where priority is set will be described. In the case where the priority is not set for each policy, for example, the priority may be defined by the arrangement order of the policies.
  • a plurality of wireless networks may be designated as the wireless network to be used. When designating a plurality of wireless networks, any one of the wireless networks is selected. Wildcards may be specified in the data exchange section item and server name item.
  • the control unit 14 performs the following process when the name resolution unit 17 determines the communication process for the packet generated by transmitting the name resolution request data to the communication software basic unit 13.
  • the control unit 14 refers to the communication software basic unit 13 and acquires the address of the communication interface 11. Further, the control unit 14 refers to the information held in the setting storage unit 16 (for example, the table of FIG. 3), and identifies the data exchange unit 12 that is the name resolution request source from the destination address of the packet. Further, the control unit 14 refers to the setting storage unit 16 and acquires the address of the name resolution server 5. Further, the control unit 14 specifies the name of the requested server 4 from the packet. Further, the control unit 14 collates the identified data exchange unit 12 and the name of the server 4 with the policy, and determines a communication process for the packet.
  • the control unit 14 passes the name resolution unit 17 and the communication software basic unit 13, and the value A is sent to the destination address from the communication processing unit 15.
  • a name resolution request packet that is designated and requests an address by the name of the server 4a is accepted.
  • the control unit 14 refers to the information held in the setting storage unit 16 (FIG. 3), and identifies the name resolution request source as the data transfer unit 12a based on the value A specified in the destination address. Also, the control unit 14 refers to the packet and acquires the name of the server 4a. Further, the control unit 14 compares the names of the data transmission / reception unit 12a and the server 4a with the policy (FIG. 4) and determines that it matches the policy 1. Further, the control unit 14 acquires the address of the name resolution server 5 a corresponding to the communication interface 11 a with reference to the setting storage unit 16 based on the contents of the policy 1.
  • the control unit 14 rewrites the source address to the address of the communication interface 11a, rewrites the destination address to the address of the name resolution server 5a, and determines a process to output to the communication interface 11a. 15 is instructed to execute the communication process. At this time, the control unit 14 holds the source port number of the name resolution request packet and the value A or the identifier of the data transfer unit 12a.
  • FIG. 5 is a diagram illustrating a table held by the control unit 14.
  • FIG. 5A shows a table when the port numbers na and nb and the values A and B are held in association with each other.
  • FIG. 5B shows a table when the port numbers na and nb are associated with the identifiers of the data transfer units 12a and 12b.
  • the control unit 14 further refers to the information held in the setting storage unit 16 (FIG. 3), so that the value A is set. Can be acquired.
  • the control unit 14 receives a name resolution response packet from the communication processing unit 15 via the communication interface 11a.
  • the control unit 14 acquires the stored value A from the destination port number.
  • the control unit 14 rewrites the destination address with the address of the communication processing unit 15, rewrites the transmission source address with the value A, and determines a process to be output to the communication software basic unit 13. Is instructed to execute the communication process.
  • the control unit 14 is, for example, an open flow controller (OFC: OpenFlow Controller) in OpenFlow (Non-Patent Documents 5 and 6).
  • OFC OpenFlow Controller
  • the control unit 14 is not limited to the OFC.
  • the control unit 14 is realized by a CPU of a computer that operates according to a program, for example.
  • the CPU may read a program from a program storage device (not shown) and operate as the control unit 14 according to the program.
  • the communication processing unit 15 executes processing on the input packet based on zero or more communication processing rules set in the control unit 14 and the communication processing execution instruction from the control unit 14. For example, the communication processing unit 15 rewrites the header of the packet or transfers the packet to another functional block in the communication terminal 1. For the packet P input from the communication software basic unit 13, for example, the communication processing unit 15 rewrites the source address in the header with the address of the communication interface 11a according to the control of the control unit 14, and converts the packet P into the communication interface 11a. Send to.
  • the communication processing unit 15 rewrites, for example, the transmission destination address in the header with the address of the communication processing unit 15 according to the control by the control unit 14 with respect to the packet Q received by the communication interface 11, and the communication software basic unit 13 Send to.
  • the communication processing unit 15 14 for transfer.
  • the communication processing unit 15 is, for example, an open flow switch (OFS: OpenFlow Switch) in OpenFlow (Non-Patent Documents 5 and 6).
  • OFS OpenFlow Switch
  • the address of the communication processing unit 15 itself is attached to the local port (Local Port) of the OFS, or a virtual Ethernet (registered trademark) device connected to the OFS and the communication software basic unit 13 It is attached to.
  • the communication processing unit 15 is not limited to OFS.
  • the communication processing unit 15 may be realized by a CPU of a computer that operates according to a program, for example.
  • the CPU may read a program from a program storage device (not shown) and operate as the communication processing unit 15 according to the program.
  • the setting storage unit 16 is a storage device that stores the correspondence between the communication interface 11 and the address of the name resolution server 5 and the correspondence between the data transfer unit 12 and a value having an address form.
  • FIG. 6 illustrates a table held by the setting storage unit 16.
  • the name resolution server 5a is connected to the wireless network 2a corresponding to the communication interface 11a. Therefore, as shown in FIG. 6, the setting storage unit 16 stores the communication interface 11a and the address of the name resolution server 5a in association with each other. Similarly, the setting storage unit 16 stores the communication interface 11b and the address of the name resolution server 5b in association with each other. Further, as shown in FIG.
  • the setting storage unit 16 stores the value A as a value corresponding to the data transfer unit 12a and stores the value B as a value corresponding to the data transfer unit 12b.
  • the setting storage unit 16 may store the correspondence relationship between the communication interface 11 and the address of the name resolution server 5 as, for example, a file or a database, or may store it in another manner.
  • the setting storage unit 16 is, for example, an operating system (OS) setting database described in Non-Patent Document 4. However, the setting storage unit 16 is not limited to this example.
  • OS operating system
  • the name resolution unit 17 refers to the setting storage unit 16 based on the information of the data exchange unit 12 of the request source. get. For example, when name resolution request data is input from the data transfer unit 12a, the name resolution unit 17 acquires a value A as an address. Then, the name resolution unit 17 designates the acquired value A as an address, and sends name resolution request data to the communication software basic unit 13.
  • the name resolution unit 17 is realized by a CPU of a computer that operates according to a program such as a DNS resolver, for example.
  • the CPU may read a program from a program storage device and operate as the name resolution unit 17 according to the program.
  • the program is, for example, a DNS resolver implemented by an OS described in Non-Patent Document 4.
  • the present invention is not limited to this example, and any program may be used as long as it acquires an address from the setting storage unit 16 for each application or process, designates the acquired address, and sends a name resolution request.
  • FIG. 7 is a sequence diagram showing an operation when the data transfer unit 12a makes a name resolution request of the server 4a.
  • the data transfer unit 12a (not shown in FIG. 7) inputs name resolution request data including the name of the server 4 to the name resolution unit 17. Then, the name resolution unit 17 acquires the value A with reference to the setting storage unit 16 based on the data input by the data transfer unit 12a. The name resolution unit 17 designates the address of the selected name resolution server 5a, and sends name resolution request data to the communication software basic unit 13 (step S1).
  • the communication software basic unit 13 determines the address of the communication processing unit 15 as the source address of the name resolution request packet according to the communication transfer rule.
  • the communication software basic unit 13 generates a name resolution request packet including the transmission source address and having a header including the value A specified by the name resolution unit 17 as a transmission destination address based on the name resolution request data. .
  • the communication software basic unit 13 sends the generated name resolution request packet to the communication processing unit 15 (step S2).
  • the communication processing unit 15 collates the name resolution request packet input from the communication software basic unit 13 with the communication processing rule, and there is no communication processing rule that matches the name resolution request packet, or the control unit 14 If the name resolution request packet matches the communication processing rule that defines the packet transfer to the server, the name resolution request packet is sent to the control unit 14 (step S3).
  • the name resolution request packet matches the communication processing rule that defines the packet transfer to the server, the name resolution request packet is sent to the control unit 14 (step S3).
  • the present embodiment a case where there is no communication processing rule that matches the name resolution request packet will be described.
  • FIG. 8 is a flowchart illustrating details of the processing of the control unit 14 in step S4.
  • control unit 14 receives a name resolution request packet from the communication processing unit 15 (step S41).
  • control unit 14 refers to the setting storage unit 16 and identifies the name resolution request source of the name resolution request packet as the data transfer unit 12a from the value A of the destination address included in the header of the name resolution request packet. (Step S42).
  • control unit 14 analyzes the name resolution request packet and extracts the name of the server 4a included in the payload (step S43).
  • control unit 14 collates the information specified in step S42 that the name resolution request source is the data transfer unit 12a and the name of the server 4a extracted in step S43 with a policy (see FIG. 4).
  • the communication interface 11a is determined as the output destination of the name resolution request packet (step S44).
  • control unit 14 refers to the setting storage unit 16 and acquires the address of the name resolution server 5a corresponding to the communication interface 11a (step S45).
  • control unit 14 rewrites the source address of the name resolution request packet to the address of the communication interface 11a, rewrites the destination address to the address of the name resolution server 5a, and executes processing to output to the communication interface 11a.
  • the communication processing unit 15 is instructed (step S46).
  • control unit 14 associates the transmission source port number of the name resolution request packet with the value A and stores them in the storage area of the control unit 14 (step S47).
  • the communication processing unit 15 executes the above-described processing instructed by the control unit 14 (step S5).
  • the communication interface 11a outputs a name resolution request packet to the wireless network 2a (not shown in FIG. 7) (step S6). As described above, the name resolution request packet is transmitted to the name resolution server 5a.
  • the communication interface 11a receives the name resolution response packet transmitted from the name resolution server 5a via the wireless network 2a and sends it to the communication processing unit 15 (step S11).
  • the communication processing unit 15 collates the name resolution response packet input from the communication interface 11a with the communication processing rule, and there is no communication processing rule that matches the name resolution response packet, or the control unit 14 If the name resolution response packet matches the communication processing rule that defines the packet transfer, the name resolution response packet is sent to the control unit 14 (step S12). In the present embodiment, a case where there is no communication processing rule that matches the name resolution response packet will be described.
  • FIG. 9 is a flowchart illustrating the details of the processing of the control unit 14 in step S13.
  • control unit 14 receives a name resolution response packet from the communication processing unit 15 (step S131).
  • control unit 14 refers to its own storage area and acquires the value A from the destination port number of the name resolution response packet (step S132).
  • step S133 the control unit 14 rewrites the destination address of the name resolution response packet to the address of the communication processing unit 15, rewrites the transmission source address to the value A, and outputs the processing to the communication software basic unit 13 to the communication processing unit 15.
  • An instruction is given (step S133). That is, when the name resolution request packet generated by the communication software basic unit 13 in step S2 is compared with the name resolution response packet output by the communication processing unit 15 according to the instruction in step S133, the destination address of the name resolution request packet and the name The source address of the resolution response packet matches, and the source address of the name resolution request packet matches the destination address of the name resolution response packet.
  • control unit 14 deletes the set of the destination port number and the value A from its own storage area (step S134).
  • the communication processing unit 15 executes the communication process instructed by the control unit 14 in step S133 (step S14).
  • the communication software basic unit 13 extracts name resolution response data from the name resolution response packet input from the communication processing unit 15 and sends it to the name resolution unit 17 (step S15).
  • the name resolution unit 17 acquires the name resolution response data transmitted from the name resolution server 5a, and sends the name resolution response data to the data transfer unit 12a (step S16).
  • the control unit 14 sends the setting information to the setting storage unit 16 so that the name resolution unit 17 sends a name resolution request to a unique destination address to each individual data transfer unit 12.
  • the control unit 14 receives the name resolution request packet via the communication software basic unit 13 and identifies the data transfer unit 12 that is the name resolution request source from the destination address of the name resolution request packet.
  • the control unit 14 combines the server name included in the name resolution request packet with the identifier of the data transfer unit 12 to collate with the policy, and the name resolution request packet is connected to the wireless network 2 corresponding to the policy. It transmits to the name resolution server 5.
  • the existing name resolution unit 17 that refers to the setting storage unit 16 and outputs name resolution request data with addresses corresponding to the data transfer units 12 as destinations.
  • the feature of is utilized. Therefore, by adding the control unit 14 and the communication processing unit 15 to the conventional terminal and storing the information in the setting storage unit 16 without changing the existing name resolution unit 17 itself, the above-described present invention is provided. This problem can be solved.
  • FIG. 10 is a diagram illustrating a communication system including the communication terminal of the present embodiment.
  • the servers 4a and 4b, the wireless networks 2a and 2b, the name resolution servers 5a and 5b, and the wired network 3 are respectively the first embodiment.
  • a policy server 6 is further added to the communication system to which the communication terminal of the first embodiment shown in FIG. 1 is connected.
  • Policy server 6 transmits a policy to communication terminal 1.
  • the trigger for the policy transmission may be, for example, a request from the communication terminal 1, a predetermined time, or a request from a device not shown in FIG.
  • the trigger of policy transmission is not limited to these.
  • the policy server 6 is, for example, an ANDSF (Access / Network / Discovery / Selection / Function) server.
  • the policy server 6 is not limited to the ANDSF server.
  • the configuration of the communication terminal 1 of the present embodiment is the same as that of the communication terminal 1 of the first embodiment shown in FIG.
  • the control unit 14 of the communication terminal 1 according to the present embodiment is further different from the control unit 14 of the first embodiment in that it receives a policy from the policy server 6.
  • the communication terminal 1 of the present embodiment in addition to the effects brought about by the communication terminal 1 of the first embodiment, it is possible to update the policy from an external device.
  • the address has been described as an example, but the same control can be performed by replacing the address with a source port number or the like.
  • the control unit refers to the setting storage unit to identify the data exchanging unit to which the identifier included in the packet is attached, and information indicating the identified data exchanging unit and the destination device included in the packet
  • the communication terminal according to mode 1 wherein a communication interface to be used is determined from the plurality of communication interfaces by collating with a predetermined policy.
  • the predetermined policy includes correspondence between the data transmission / reception unit, information indicating the destination device, and a communication interface to be used.
  • the setting storage unit associates and holds each communication interface and the address of the corresponding name resolution server, The communication terminal according to any one of aspects 1 to 3, wherein the control unit specifies an address of a name resolution server corresponding to the determined communication interface based on the setting storage unit.
  • the control unit receives the predetermined policy from a policy server.
  • the control unit holds the transmission source port number of the packet and the identifier of the data transfer unit in association with each other, and when receiving a response packet for the packet, based on the association, the destination port of the received response packet Identify the address associated with the number,
  • the communication terminal according to any one of modes 1 to 5, wherein the communication processing unit changes a transmission source address of the response packet to an address specified by the control unit and outputs the changed address to the communication software basic unit.
  • the control unit deletes the held association when the address associated with the destination port number of the received response packet is specified.
  • the communication method according to the second aspect is as described above.
  • the communication terminal refers to the setting storage unit, and specifies the data transfer unit attached with the identifier included in the packet; And a step of collating information indicating the specified data exchange unit and the destination device included in the packet with the predetermined policy and determining a communication interface to be used from the plurality of communication interfaces.
  • the communication terminal associates each communication interface with the address of the corresponding name resolution server and holds it in the setting storage unit;
  • the communication method according to any one of modes 8 to 10 further comprising: specifying an address of a name resolution server corresponding to the determined communication interface based on the setting storage unit.
  • the communication terminal holds the transmission source port number of the packet and the identifier of the data transfer unit in association with each other; When receiving a response packet to the packet, the step of identifying an address associated with the destination port number of the received response packet based on the association held;
  • the communication method according to any one of aspects 8 to 12, further comprising: changing a transmission source address of the response packet to the specified address.
  • the communication method according to mode 13, comprising a step of deleting the held association when the communication terminal specifies an address associated with the destination port number of the received response packet.
  • the program according to the third aspect is as described above.
  • [Form 18] A process of associating each communication interface with the corresponding address of the name resolution server and holding in the setting storage unit; The program according to any one of forms 15 to 17, which causes the computer to execute processing for specifying an address of a name resolution server corresponding to the determined communication interface based on the setting storage unit.
  • [Mode 20] A process of associating and holding the transmission source port number of the packet and the identifier of the data transfer unit; When a response packet for the packet is received, a process for identifying an address associated with a destination port number of the received response packet based on the association held.

Abstract

In the present invention, a communication terminal is provided with a plurality of communication interfaces and a data sending and receiving unit that sends and receives data to and from a destination device, and the communication terminal carries out the following: associates an identifier of a data sending and receiving unit and a data sending and receiving unit, and stores such association in a settings storage unit; acquires the identifier of the data sending and receiving unit by referencing the settings storage unit; generates a packet that includes information indicating a destination device and includes the acquired identifier; uses a prescribed policy, and the information indicating the destination device and the identifier of the data sending and receiving unit that are included in the packet, to determine the communication interface to be used; specifies an address in a name resolution server that corresponds to the determined communication interface; changes the packet destination address to the specified name resolution server address; and sends the packet via the determined communication interface. The present invention makes it possible to send name resolution request data to the appropriate name resolution server using a communication interface which was specified by a policy, on the basis of an application name or the like.

Description

通信端末、通信方法およびプログラムCommunication terminal, communication method and program
　（関連出願についての記載）
　本発明は、日本国特許出願：特願２０１４－０３４７８４号（２０１４年２月２６日出願）の優先権主張に基づくものであり、同出願の全記載内容は引用をもって本書に組み込み記載されているものとする。
　本発明は、通信端末、通信方法およびプログラムに関し、特に、複数のネットワークに接続可能な通信端末、ならびに、その通信端末に適用される通信方法およびプログラムに関する。 (Description of related applications)
The present invention is based on the priority claim of Japanese patent application: Japanese Patent Application No. 2014-034784 (filed on Feb. 26, 2014), the entire contents of which are incorporated herein by reference. Shall.
The present invention relates to a communication terminal, a communication method, and a program, and more particularly, to a communication terminal that can be connected to a plurality of networks, and a communication method and program applied to the communication terminal.
　携帯電話やスマートフォンなどに代表される通信端末には、無線ＬＡＮ（Local Area Network）やＬＴＥ（Long Term Evolution）などの複数の異なる無線インタフェースが搭載されている。非特許文献１ないし３には、ＡＮＤＳＦ（Access Network Discovery and Selection Function）と呼ばれる標準規格が記載されている。非特許文献１および２には、アプリケーション名やドメイン名などを用いて通信トラフィックを指定し、これらの無線インタフェースに振り分けるためのポリシの記述法と、ポリシを与えられた通信端末に期待される動作が記載されている。 Communication terminals such as mobile phones and smartphones are equipped with a plurality of different wireless interfaces such as wireless LAN (Local Area Network) and LTE (Long Term Evolution). Non-Patent Documents 1 to 3 describe a standard called ANDSF (Access Network Discovery and Selection Function). Non-Patent Documents 1 and 2 describe a policy description method for specifying communication traffic using an application name, a domain name, and the like, and distributing the traffic to these wireless interfaces, and operations expected for a communication terminal to which the policy is given. Is described.
　特許文献１には、ＤＮＳ（Domain Name Service）クエリに含まれるドメイン名とポリシとを照合し、ポリシに指定された無線インタフェースを用い、当該無線インタフェースに対応付けられたＤＮＳサーバへＤＮＳクエリを送信する技術が記載されている。 In Patent Literature 1, a domain name and a policy included in a DNS (Domain Name Service) query are collated, and a DNS query is transmitted to a DNS server associated with the radio interface using a radio interface specified in the policy. The technology to do is described.
　非特許文献４には、通信端末向けのオペレーティングシステム（ＯＳ：Operating System）であるAndroidが記載されている。Androidには、アプリケーションのプロセス識別子（ＰＩＤ：Process ID）毎にＤＮＳサーバのアドレスを設定するＤＮＳリゾルバが実装されている。ＤＮＳリゾルバでは、設定データベースに、ＰＩＤを含む文字列と、ＤＮＳサーバのアドレスとを対応付けて記憶することにより、当該設定を行う。また、設定データベースには、無線インタフェースごとに対応付けられたＤＮＳサーバのアドレスが記憶されている。 Non-Patent Document 4 describes Android, which is an operating system (OS: Operating System) for communication terminals. In Android, a DNS resolver for setting a DNS server address for each process identifier (PID: Process ： ID) of an application is installed. The DNS resolver performs the setting by storing the character string including the PID and the address of the DNS server in the setting database in association with each other. The setting database stores the DNS server address associated with each wireless interface.
　また、関連技術として、非特許文献５、６には、集中制御型のネットワークを実現するオープンフロー（OpenFlow）が記載されている。オープンフローは、通信をエンドツーエンドのフローとして捉え、フロー単位で経路制御、障害回復、負荷分散、最適化を行うものである。非特許文献６に仕様化されているオープンフロースイッチ（ＯＦＳ：OpenFlow Switch）は、オープンフローコントローラ（ＯＦＣ：OpenFlow Controller）との通信用のセキュアチャネル（Secure Channel）を備え、ＯＦＣから適宜追加または書き換え指示されるフローテーブル（Flow Table）に従って動作する。フローテーブルには、フロー毎に、パケットヘッダ（Packet Header）と照合するマッチ条件（Match Fields）と、フロー統計情報（Counters）と、処理内容を定義したインストラクション（Instructions）と、の組が定義される（非特許文献６の「5.2 Flow Table」の項参照）。 As related technologies, Non-Patent Documents 5 and 6 describe OpenFlow (OpenFlow) that realizes a centralized control network. OpenFlow captures communication as an end-to-end flow and performs path control, failure recovery, load balancing, and optimization on a per-flow basis. The OpenFlow switch (OFS: OpenFlow Switch) specified in Non-Patent Document 6 has a secure channel (Secure Channel) for communication with the OpenFlow controller (OFC) and is added or rewritten as appropriate from the OFC. Operates according to the specified flow table (Flow Table). In the flow table, for each flow, a set of matching conditions (Match Fields) to be matched with the packet header (Packet Header), flow statistical information (Counters), and instructions (Instructions) that define the processing contents is defined. (Refer to “5.2 Flow Table” in Non-Patent Document 6).
　例えば、ＯＦＳは、パケットを受信すると、フローテーブルから、受信パケットのヘッダ情報に適合するマッチ条件（非特許文献６の「5.3 Matching」参照）を持つエントリ（Entry）を検索する。検索の結果、受信パケットに適合するエントリが見つかった場合、ＯＦＳは、フロー統計情報（カウンタ）を更新するとともに、受信パケットに対して、当該エントリのインストラクションフィールドに記述された処理内容（指定ポートからのパケット送信、フラッディング（Flooding）、廃棄など）を実施する。一方、検索の結果、受信パケットに適合するエントリが見つからなかった場合、ＯＦＳは、セキュアチャネルを介して、ＯＦＣに対してエントリ設定の要求、すなわち、受信パケットを処理するための制御情報の送信要求（Packet-Inメッセージ）を送信する。ＯＦＳは、処理内容が定められたフローエントリを受け取ってフローテーブルを更新する。このように、ＯＦＳは、フローテーブルに格納されたエントリを制御情報として用いてパケット転送を行う。 For example, when the packet is received, the OFS searches the flow table for an entry having a matching condition (see “5.3 Matching” in Non-Patent Document 6) that matches the header information of the received packet. When an entry that matches the received packet is found as a result of the search, the OFS updates the flow statistical information (counter) and processes the processing contents (from the designated port) described in the instruction field of the entry for the received packet. Packet transmission, flooding, discarding, etc.). On the other hand, if no entry matching the received packet is found as a result of the search, OFS requests entry setting to OFC via the secure channel, that is, a control information transmission request for processing the received packet. (Packet-In message) is transmitted. The OFS receives the flow entry in which the processing content is defined and updates the flow table. As described above, the OFS performs packet transfer using the entry stored in the flow table as control information.
特開２００６－３３３０８０号公報JP 2006-33080 A
　上記特許文献および非特許文献の全開示内容は、本書に引用をもって繰り込み記載されているものとする。以下の分析は、本発明者によってなされたものである。 The entire disclosures of the above patent documents and non-patent documents are incorporated herein by reference. The following analysis was made by the present inventors.
　一般に、通信端末のアプリケーションがサーバと通信を行う際、ＤＮＳ（Domain Name Service）を用いた名前解決によって、サーバのアドレスを求める。ＡＮＤＳＦのポリシに基づいて複数の無線インタフェースに対してアプリケーションの通信トラフィックを振り分けるとき、同様にＤＮＳクエリについても、ＤＮＳクエリ元のアプリケーションや、ＤＮＳクエリに含まれるドメイン名などを用いて、無線インタフェースに対応付けられたＤＮＳサーバに送信しないと、不都合が生じる場合がある。 Generally, when an application of a communication terminal communicates with a server, the server address is obtained by name resolution using DNS (Domain Name Service). When application communication traffic is distributed to a plurality of wireless interfaces based on the ANDSF policy, the DNS query is also assigned to the wireless interface using the DNS query source application or the domain name included in the DNS query. If it is not transmitted to the associated DNS server, inconvenience may occur.
　例えば、無線ＬＡＮからのみ到達可能なサーバの名前については、無線ＬＡＮに対応付けられたＤＮＳサーバのみが名前解決することができる。このような場合に、ＬＴＥに対応付けられたＤＮＳサーバにＤＮＳクエリを行うと、サーバの名前を解決することができなくなる。また、携帯キャリアのサーバのように、ＬＴＥ網から到達可能なアドレスと、その他ネットワークから到達可能なアドレスとを分けている場合に、ＬＴＥに対応付けられたＤＮＳサーバで名前解決を行ってアプリケーションの通信トラフィックを無線ＬＡＮに振り分けると、当該通信トラフィックは到達不能となる。 For example, for the name of a server that can be reached only from the wireless LAN, only the DNS server associated with the wireless LAN can resolve the name. In such a case, if a DNS query is made to the DNS server associated with LTE, the server name cannot be resolved. In addition, when the address reachable from the LTE network and the address reachable from the other network are separated like a mobile carrier server, name resolution is performed by the DNS server associated with LTE to When communication traffic is distributed to the wireless LAN, the communication traffic becomes unreachable.
　したがって、ポリシを参照し、ＤＮＳクエリ元のアプリケーション名やＤＮＳクエリに含まれるドメイン名などを用いて、ポリシに指定された無線インタフェースを用い、当該無線インタフェースに対応付けられたＤＮＳサーバへＤＮＳクエリを送信する通信端末を実現する必要がある。ところが、かかる通信端末を実現するために、既存の通信端末に実装されているＤＮＳリゾルバを大きく変更することは、実装コストの観点から問題となる。 Therefore, referring to the policy, using the application name of the DNS query source, the domain name included in the DNS query, etc., using the radio interface specified in the policy, the DNS query is sent to the DNS server associated with the radio interface. It is necessary to realize a communication terminal for transmission. However, in order to realize such a communication terminal, greatly changing the DNS resolver mounted on an existing communication terminal is problematic from the viewpoint of mounting cost.
　ここで、特許文献１に記載された技術を用いた場合には、アプリケーション名を使用することができない。一方、非特許文献４に記載されたAndroidに実装されたＤＮＳリゾルバのみでは、ドメイン名を使用することができない。さらに、特許文献１で記載されている技術と、非特許文献４に記載されているＤＮＳリゾルバとを単純に組み合わせた場合には、そのようなＤＮＳリゾルバを新たに実装しなければならなくなる。 Here, when the technique described in Patent Document 1 is used, the application name cannot be used. On the other hand, the domain name cannot be used only with the DNS resolver implemented in Android described in Non-Patent Document 4. Furthermore, when the technique described in Patent Document 1 and the DNS resolver described in Non-Patent Document 4 are simply combined, such a DNS resolver must be newly mounted.
　そこで、名前解決要求元のアプリケーション名や名前解決要求データに含まれるドメイン名などに基づいてポリシに指定された通信インタフェースを使用すると共に、当該通信インタフェースに対応付けられた名前解決サーバへ名前解決要求データを送信する技術を、既存の名前解決部に変更を加えることなく実現することが課題となる。本発明の目的は、かかる課題解決に寄与する通信端末、通信方法およびプログラムを提供することにある。 Therefore, use the communication interface specified in the policy based on the application name of the name resolution request source and the domain name included in the name resolution request data, and request the name resolution to the name resolution server associated with the communication interface. It becomes a problem to realize a technology for transmitting data without changing the existing name resolution unit. An object of the present invention is to provide a communication terminal, a communication method, and a program that contribute to solving the problem.
　本発明の第１の態様に係る通信端末は、複数の通信インタフェースと、宛先装置との間でデータを送受信するデータ授受部と、前記データ授受部の識別子と前記データ授受部とを関連付けて保持する設定記憶部と、前記設定記憶部を参照して前記データ授受部の識別子を取得する名前解決部と、前記宛先装置を示す情報を含むと共に前記名前解決部が取得した識別子を含むパケットを生成する通信ソフトウェア基本部と、前記パケットに含まれる前記宛先装置を示す情報および前記データ授受部の識別子と所定のポリシとを用いて、前記複数の通信インタフェースの中から使用すべき通信インタフェースを決定し、決定した通信インタフェースに対応する名前解決サーバのアドレスを特定する制御部と、前記パケットの宛先アドレスを前記制御部が特定した名前解決サーバのアドレスに変更すると共に前記制御部が決定した通信インタフェースを介して前記パケットを送出する通信処理部と、を備えている。 A communication terminal according to the first aspect of the present invention holds a plurality of communication interfaces, a data transmission / reception unit that transmits / receives data to / from a destination device, an identifier of the data transmission / reception unit, and the data transmission / reception unit in association with each other Generating a packet that includes information indicating the destination device and the identifier acquired by the name resolution unit, and a name resolution unit that acquires the identifier of the data transfer unit with reference to the setting storage unit A communication interface to be used is determined from among the plurality of communication interfaces, using a communication software basic unit to perform, information indicating the destination device included in the packet, an identifier of the data transfer unit, and a predetermined policy A control unit that identifies an address of a name resolution server corresponding to the determined communication interface, and a destination address of the packet And a, a communication processing unit for sending the packet via the communication interface, wherein the control unit decides as to change the address of the name resolution server control section is specified.
　本発明の第２の態様に係る通信方法は、複数の通信インタフェースと、宛先装置との間でデータを送受信するデータ授受部とを備えた通信端末が、前記データ授受部の識別子と前記データ授受部とを関連付けて設定記憶部に保持する工程と、前記設定記憶部を参照して前記データ授受部の識別子を取得する工程と、前記宛先装置を示す情報を含むと共に前記取得した識別子を含むパケットを生成する工程と、前記パケットに含まれる前記宛先装置を示す情報および前記データ授受部の識別子と所定のポリシとを用いて、前記複数の通信インタフェースの中から使用すべき通信インタフェースを決定する工程と、決定した通信インタフェースに対応する名前解決サーバのアドレスを特定する工程と、前記パケットの宛先アドレスを前記特定した名前解決サーバのアドレスに変更すると共に、前記決定した通信インタフェースを介して前記パケットを送出する工程と、を含む。 In the communication method according to the second aspect of the present invention, there is provided a communication terminal including a plurality of communication interfaces and a data transmission / reception unit that transmits / receives data to / from a destination device. A packet that includes information indicating the destination device and includes the acquired identifier, a step of associating and storing the information in the setting storage unit, a step of acquiring the identifier of the data transfer unit with reference to the setting storage unit And a step of determining a communication interface to be used from among the plurality of communication interfaces using information indicating the destination device included in the packet, an identifier of the data transfer unit, and a predetermined policy Specifying the address of the name resolution server corresponding to the determined communication interface, and specifying the destination address of the packet. With changing the address of the name resolution server, and a step of sending the packet via the communication interface to the determined.
　本発明の第３の態様に係るプログラムは、複数の通信インタフェースと、宛先装置との間でデータを送受信するデータ授受部とを備えた通信端末に設けられたコンピュータに対して、前記データ授受部の識別子と前記データ授受部とを関連付けて設定記憶部に保持する処理と、前記設定記憶部を参照して前記データ授受部の識別子を取得する処理と、前記宛先装置を示す情報を含むと共に前記取得した識別子を含むパケットを生成する処理と、前記パケットに含まれる前記宛先装置を示す情報および前記データ授受部の識別子と所定のポリシとを用いて、前記複数の通信インタフェースの中から使用すべき通信インタフェースを決定する処理と、決定した通信インタフェースに対応する名前解決サーバのアドレスを特定する処理と、前記パケットの宛先アドレスを前記特定した名前解決サーバのアドレスに変更すると共に、前記決定した通信インタフェースを介して前記パケットを送出する処理と、を実行させる。なお、プログラムは、非一時的なコンピュータ可読記録媒体（non-transitory computer-readable storage medium）に記録されたプログラム製品として提供することができる。 A program according to a third aspect of the present invention provides a data exchange unit for a computer provided in a communication terminal including a plurality of communication interfaces and a data exchange unit that transmits and receives data to and from a destination device. Including a process of associating the identifier of the data and the data exchange unit and holding the identifier in the setting storage unit, a process of obtaining the identifier of the data exchange unit with reference to the setting storage unit, and information indicating the destination device It should be used from among the plurality of communication interfaces using a process for generating a packet including the acquired identifier, information indicating the destination device included in the packet, an identifier of the data transmission / reception unit, and a predetermined policy A process for determining a communication interface; a process for specifying an address of a name resolution server corresponding to the determined communication interface; The destination address of Tsu bets while changing the addresses of name resolution server that the identified, to execute a process of sending the packet via the communication interface to the determined. The program can be provided as a program product recorded in a non-transitory computer-readable storage medium.
　本発明に係る通信端末、通信方法およびプログラムによると、名前解決要求元のアプリケーション名や名前解決要求データに含まれるドメイン名などに基づいてポリシに指定された通信インタフェースを使用すると共に、当該通信インタフェースに対応付けられた名前解決サーバへ名前解決要求データを送信する技術を、既存の名前解決部に変更を加えることなく実現することが可能となる。 According to the communication terminal, the communication method, and the program according to the present invention, the communication interface specified in the policy is used based on the application name of the name resolution request source, the domain name included in the name resolution request data, and the communication interface. It is possible to realize a technique for transmitting name resolution request data to the name resolution server associated with the URL without changing the existing name resolution unit.
第１の実施形態に係る通信端末を備えた通信システムを例示する図である。It is a figure which illustrates the communication system provided with the communication terminal which concerns on 1st Embodiment. 第１の実施形態に係る通信端末の構成を例示するブロック図である。It is a block diagram which illustrates the composition of the communication terminal concerning a 1st embodiment. 第１の実施形態に係る通信端末の設定記憶部が保持するデータを例示する図である。It is a figure which illustrates the data which the setting memory | storage part of the communication terminal which concerns on 1st Embodiment hold | maintains. 第１の実施形態に係る通信端末におけるポリシを例示する図である。It is a figure which illustrates the policy in the communication terminal which concerns on 1st Embodiment. 第１の実施形態に係る通信端末の制御部が保持するデータを例示する図である。It is a figure which illustrates the data which the control part of the communication terminal which concerns on 1st Embodiment hold | maintains. 第１の実施形態に係る通信端末の設定記憶部が保持するデータを例示する図である。It is a figure which illustrates the data which the setting memory | storage part of the communication terminal which concerns on 1st Embodiment hold | maintains. 第１の実施形態に係る通信端末の動作を例示するシーケンス図である。It is a sequence diagram which illustrates operation | movement of the communication terminal which concerns on 1st Embodiment. 第１の実施形態に係る通信端末が名前解決要求パケットを送出する動作を例示するフロー図である。It is a flowchart which illustrates the operation | movement which the communication terminal which concerns on 1st Embodiment sends out a name resolution request packet. 第１の実施形態に係る通信端末が名前解決応答パケットを受信する動作を例示するフロー図である。It is a flowchart which illustrates the operation | movement which the communication terminal which concerns on 1st Embodiment receives a name resolution response packet. 第２の実施形態に係る通信端末を備えた通信システムを例示する図である。It is a figure which illustrates the communication system provided with the communication terminal which concerns on 2nd Embodiment.
　はじめに、一実施形態の概要について説明する。なお、この概要に付記する図面参照符号は、専ら理解を助けるための例示であり、本発明を図示の態様に限定することを意図するものではない。 First, an outline of one embodiment will be described. Note that the reference numerals of the drawings attached to this summary are merely examples for facilitating understanding, and are not intended to limit the present invention to the illustrated embodiment.
　図１は、一実施形態に係る通信端末１を備えた通信システムの構成を示す図である。図２は、通信端末１の構成を例示するブロック図である。図２を参照すると、通信端末１は、複数の通信インタフェース１１ａ、１１ｂ、データ授受部１２ａ、１２ｂ、設定記憶部１６、名前解決部１７、通信ソフトウェア基本部１３、制御部１４、および、通信処理部１５を備えている。 FIG. 1 is a diagram illustrating a configuration of a communication system including a communication terminal 1 according to an embodiment. FIG. 2 is a block diagram illustrating the configuration of the communication terminal 1. Referring to FIG. 2, the communication terminal 1 includes a plurality of communication interfaces 11a and 11b, data transfer units 12a and 12b, a setting storage unit 16, a name resolution unit 17, a communication software basic unit 13, a control unit 14, and a communication process. Part 15 is provided.
　データ授受部１２ａは、宛先装置（例えば、図１のサーバ４ａ）との間でデータを送受信する。設定記憶部１６は、データ授受部１２ａ、１２ｂの識別子（例えば、アドレス）とデータ授受部１２ａ、１２ｂとを関連付けて保持する。名前解決部１７は、データ授受部１２ａの要求に基づいて、設定記憶部１６を参照してデータ授受部１２ａの識別子を取得する。通信ソフトウェア基本部１３は、宛先装置を示す情報を含むと共に名前解決部１７が取得した識別子を（例えば、宛先アドレスとして）含むパケットを生成する。制御部１４は、前記パケットに含まれる前記宛先装置を示す情報および前記データ授受部の識別子と所定のポリシとを用いて、複数の通信インタフェース１１ａ、１１ｂの中から使用すべき通信インタフェース（例えば、１１ａ）を決定し、決定した通信インタフェース１１ａに対応する名前解決サーバ（例えば、５ａ）のアドレスを特定する。通信処理部１５は、前記パケットの宛先アドレスを制御部１４が特定した名前解決サーバ５ａのアドレスに変更すると共に、制御部１４が決定した通信インタフェース１１ａを介して前記パケットを送出する。 The data transfer unit 12a transmits and receives data to and from the destination device (for example, the server 4a in FIG. 1). The setting storage unit 16 holds the identifiers (for example, addresses) of the data transfer units 12a and 12b and the data transfer units 12a and 12b in association with each other. The name resolution unit 17 refers to the setting storage unit 16 and acquires the identifier of the data transfer unit 12a based on the request of the data transfer unit 12a. The communication software basic unit 13 generates a packet including information indicating the destination device and including the identifier acquired by the name resolution unit 17 (for example, as a destination address). The control unit 14 uses the information indicating the destination device included in the packet, the identifier of the data transfer unit, and a predetermined policy to use a communication interface (for example, a plurality of communication interfaces 11a and 11b). 11a) is determined, and the address of the name resolution server (for example, 5a) corresponding to the determined communication interface 11a is specified. The communication processing unit 15 changes the destination address of the packet to the address of the name resolution server 5a specified by the control unit 14, and sends the packet through the communication interface 11a determined by the control unit 14.
　制御部１４は、設定記憶部１６を参照して前記パケットに含まれる識別子を付されたデータ授受部１２ａを特定すると共に、特定したデータ授受部１２ａと前記パケットに含まれる宛先装置を示す情報を所定のポリシ（例えば、図４）に照合して複数の通信インタフェース１１ａ、１１ｂの中から使用すべき通信インタフェース（例えば、無線ネットワーク２ａに対応する通信インタフェース１１ａ）を決定するようにしてもよい。ここで、所定のポリシは、データ授受部と宛先装置を示す情報と使用すべき通信インタフェースとの対応付けを含んでいてもよい。 The control unit 14 refers to the setting storage unit 16 to identify the data transmission / reception unit 12a to which the identifier included in the packet is attached, and information indicating the identified data transmission / reception unit 12a and the destination device included in the packet. A communication interface to be used (for example, the communication interface 11a corresponding to the wireless network 2a) may be determined from the plurality of communication interfaces 11a and 11b by collating with a predetermined policy (for example, FIG. 4). Here, the predetermined policy may include a correspondence between information indicating the data transmission / reception unit and the destination device and a communication interface to be used.
　また、設定記憶部１６は、各通信インタフェースと対応する名前解決サーバのアドレスとを関連付けて保持し（例えば、図６）、制御部１４は、決定した通信インタフェース１１ａに対応する名前解決サーバ５ａのアドレスを設定記憶部１６に基づいて特定してもよい。 Further, the setting storage unit 16 holds each communication interface in association with the address of the corresponding name resolution server (for example, FIG. 6), and the control unit 14 stores the name resolution server 5a corresponding to the determined communication interface 11a. The address may be specified based on the setting storage unit 16.
　かかる通信端末１によると、既存の名前解決部の動作に変更を加えることなく、名前解決要求元のアプリケーション名などに基づいてポリシに指定された通信インタフェースを使用しつつ、当該通信インタフェースに対応付けられた名前解決サーバへ名前解決要求データを送信することが可能となる。 According to the communication terminal 1, without changing the operation of the existing name resolution unit, the communication interface specified in the policy based on the application name of the name resolution request source is used, and the corresponding communication interface is associated. Name resolution request data can be transmitted to the designated name resolution server.
＜実施形態１＞
　次に、第１の実施形態に係る通信端末ついて、図面を参照して説明する。以下の実施形態では、一例として、通信端末が無線用の通信インタフェースを介して複数の無線ネットワークに接続する場合について説明する。ただし、本発明は、通信端末が複数の無線ネットワークにアクセスする場合に限らず、通信端末が複数の有線ネットワークに接続する場合や、無線ネットワークと有線ネットワークから成る複数のネットワークに接続する場合にも、同様に適用することができる。 <Embodiment 1>
Next, the communication terminal according to the first embodiment will be described with reference to the drawings. In the following embodiments, as an example, a case will be described in which a communication terminal connects to a plurality of wireless networks via a wireless communication interface. However, the present invention is not limited to the case where the communication terminal accesses a plurality of wireless networks, but also when the communication terminal connects to a plurality of wired networks or to connect to a plurality of networks composed of a wireless network and a wired network. Can be applied as well.
　図１は、本実施形態に係る通信端末１を含む通信システムの構成を例示する図である。サーバ４は、本実施形態の通信端末１との間でパケットを送受信することで、予め定められたサービスを提供する。サーバ４によって提供されるサービスの内容は、特に限定されない。図１は、通信システムが２台のサーバ４ａ，４ｂを含む場合を例示する。ただし、サーバ４の台数は２台に限定されない。なお、サーバ４ａ，４ｂを区別する必要がない場合には、「サーバ４」と記す。サーバ４は、有線ネットワーク３に接続されていてもよい。本実施形態では、サーバ４が無線ネットワーク２に接続される場合について説明する。図１は、サーバ４ａが無線ネットワーク２ａに接続され、サーバ４ｂが無線ネットワーク２ｂに接続される場合を示す。サーバ４ａに無線ネットワーク２ａ経由で通信するときのサーバ４ａのアドレスは、サーバ４ａに有線ネットワーク３経由で通信するときのサーバ４ａのアドレスとは異なっている。 FIG. 1 is a diagram illustrating a configuration of a communication system including a communication terminal 1 according to the present embodiment. The server 4 provides a predetermined service by transmitting and receiving packets to and from the communication terminal 1 of the present embodiment. The contents of the service provided by the server 4 are not particularly limited. FIG. 1 illustrates a case where the communication system includes two servers 4a and 4b. However, the number of servers 4 is not limited to two. In addition, when it is not necessary to distinguish the servers 4a and 4b, they are referred to as “server 4”. The server 4 may be connected to the wired network 3. In the present embodiment, a case where the server 4 is connected to the wireless network 2 will be described. FIG. 1 shows a case where the server 4a is connected to the wireless network 2a and the server 4b is connected to the wireless network 2b. The address of the server 4a when communicating with the server 4a via the wireless network 2a is different from the address of the server 4a when communicating with the server 4a via the wired network 3.
　通信端末１は、複数の無線ネットワーク２と無線によって接続される。図１は、通信端末１が２つの無線ネットワーク２ａ，２ｂに接続される場合を例示する。ただし、通信端末１に接続される無線ネットワーク２の数は、特に限定されない。なお、無線ネットワーク２ａ，２ｂを区別する必要がない場合には、「無線ネットワーク２」と記す。無線ネットワーク２は、有線ネットワーク３と直接的または間接的に接続される。サーバ４は、有線ネットワーク３と直接的または間接的に接続される。 The communication terminal 1 is connected to a plurality of wireless networks 2 wirelessly. FIG. 1 illustrates a case where the communication terminal 1 is connected to two wireless networks 2a and 2b. However, the number of the wireless networks 2 connected to the communication terminal 1 is not particularly limited. In addition, when it is not necessary to distinguish between the radio networks 2a and 2b, the radio networks 2a and 2b are referred to as “radio network 2”. The wireless network 2 is directly or indirectly connected to the wired network 3. The server 4 is directly or indirectly connected to the wired network 3.
　名前解決サーバ５は、通信端末１から名前解決要求パケットを受信すると、名前解決要求パケットを解釈し、名前解決要求パケットに含まれている装置の名前に対応するアドレスを検索し、その名前とそのアドレスとを含む名前解決応答パケットを通信端末１に送信する。図１では、通信システムが２台の名前解決サーバ５ａ，５ｂを含む場合を例示する。ただし、名前解決サーバ５の台数は特に限定されない。なお、名前解決サーバ５ａ，５ｂを区別する必要がない場合には、「名前解決サーバ５」と記す。名前解決サーバ５は、有線ネットワーク３に接続されていてもよい。本実施形態では、名前解決サーバ５が無線ネットワーク２に接続される場合について説明する。図１は、名前解決サーバ５ａが無線ネットワーク２ａに接続され、名前解決サーバ５ｂが無線ネットワーク２ｂに接続される場合を示す。 When receiving the name resolution request packet from the communication terminal 1, the name resolution server 5 interprets the name resolution request packet, searches for an address corresponding to the name of the device included in the name resolution request packet, A name resolution response packet including the address is transmitted to the communication terminal 1. FIG. 1 illustrates a case where the communication system includes two name resolution servers 5a and 5b. However, the number of name resolution servers 5 is not particularly limited. When it is not necessary to distinguish between the name resolution servers 5a and 5b, the name resolution server 5 is described. The name resolution server 5 may be connected to the wired network 3. In the present embodiment, a case where the name resolution server 5 is connected to the wireless network 2 will be described. FIG. 1 shows a case where the name resolution server 5a is connected to the wireless network 2a and the name resolution server 5b is connected to the wireless network 2b.
　通信端末１は、例えば、携帯電話機、スマートフォン、タブレット端末、パーソナルコンピュータ（ＰＣ：Personal Computer）等である。ただし、通信端末１は、これらの例に限定されない。 The communication terminal 1 is, for example, a mobile phone, a smartphone, a tablet terminal, a personal computer (PC: Personal Computer), or the like. However, the communication terminal 1 is not limited to these examples.
　無線ネットワーク２は、例えば、無線ＬＡＮ、ＵＴＲＡＮ（Universal Terrestrial Radio Access Network）、Ｅ－ＵＴＲＡＮ（Evolved Universal Terrestrial Radio Access Network）等である。ただし、無線ネットワーク２は、これら以外の無線ネットワークであってもよい。 The wireless network 2 is, for example, a wireless LAN, UTRAN (Universal Terrestrial Radio Access Network), E-UTRAN (Evolved Universal Terrestrial Radio Access Network), or the like. However, the wireless network 2 may be a wireless network other than these.
　有線ネットワーク３は、例えば、インターネットである。ただし、有線ネットワーク３はインターネットに限定されない。 The wired network 3 is, for example, the Internet. However, the wired network 3 is not limited to the Internet.
　サーバ４は、例えば、Ｗｅｂサーバである。ただし、サーバ４はＷｅｂサーバに限定されない。 The server 4 is, for example, a Web server. However, the server 4 is not limited to a Web server.
　名前解決サーバ５は、例えば、ＤＮＳ（Domain Name Service）サーバである。ただし、名前解決サーバ５はＤＮＳサーバに限定されない。 The name resolution server 5 is, for example, a DNS (Domain Name Service) server. However, the name resolution server 5 is not limited to a DNS server.
　図２は、本実施形態の通信端末１の構成を例示するブロック図である。図２を参照すると、通信端末１は、複数の通信インタフェース１１、データ授受部１２、通信ソフトウェア基本部１３、制御部１４、通信処理部１５、設定記憶部１６、および、名前解決部１７を備えている。 FIG. 2 is a block diagram illustrating the configuration of the communication terminal 1 of the present embodiment. Referring to FIG. 2, the communication terminal 1 includes a plurality of communication interfaces 11, a data exchange unit 12, a communication software basic unit 13, a control unit 14, a communication processing unit 15, a setting storage unit 16, and a name resolution unit 17. ing.
　通信インタフェース１１は、通信処理部１５に接続される。通信ソフトウェア基本部１３は、データ授受部１２、通信処理部１５および制御部１４に接続される。制御部１４は、通信処理部１５と、設定記憶部１６に接続される。なお、制御部１４と通信処理部１５は直接接続されていなくてもよい。例えば、通信ソフトウェア基本部１３を介して、制御部１４と通信処理部１５とが接続されていてもよい。本実施形態では、制御部１４と通信処理部１５が直接接続される場合について説明する。名前解決部１７は、データ授受部１２、通信ソフトウェア基本部１３および設定記憶部１６に接続される。なお、名前解決部１７とデータ授受部１２は、直接接続されていなくてもよい。例えば、通信ソフトウェア基本部１３を介して、名前解決部１７とデータ授受部１２が接続されていてもよい。 The communication interface 11 is connected to the communication processing unit 15. The communication software basic unit 13 is connected to the data transfer unit 12, the communication processing unit 15, and the control unit 14. The control unit 14 is connected to the communication processing unit 15 and the setting storage unit 16. Note that the control unit 14 and the communication processing unit 15 may not be directly connected. For example, the control unit 14 and the communication processing unit 15 may be connected via the communication software basic unit 13. In the present embodiment, a case where the control unit 14 and the communication processing unit 15 are directly connected will be described. The name resolution unit 17 is connected to the data transfer unit 12, the communication software basic unit 13, and the setting storage unit 16. The name resolution unit 17 and the data transfer unit 12 may not be directly connected. For example, the name resolution unit 17 and the data transfer unit 12 may be connected via the communication software basic unit 13.
　通信インタフェース１１は、無線ネットワーク２を介して外部と通信を行う。１つの通信インタフェース１１は、少なくとも１つの無線ネットワーク２に対応する。通信インタフェース１１は、通信処理部１５から入力されたパケットを無線ネットワーク２に出力する。また、通信インタフェース１１は、無線ネットワーク２から入力されたパケットを通信処理部１５に送る。本実施形態では、通信端末１が２つの通信インタフェース１１ａ，１１ｂを備え、通信インタフェース１１ａが無線ネットワーク２ａに対応し、通信インタフェース１１ｂが無線ネットワーク２ｂに対応するものとして説明する。通信インタフェース１１ａ，１１ｂを区別する必要がない場合には、「通信インタフェース１１」と記す。通信端末１は、３つ以上の通信インタフェース１１を備えていてもよい。通信インタフェース１１は、例えば、無線ＬＡＮモジュールや無線モデムモジュールである。ただし、通信インタフェース１１は、これらの例に限定されない。 The communication interface 11 communicates with the outside via the wireless network 2. One communication interface 11 corresponds to at least one wireless network 2. The communication interface 11 outputs the packet input from the communication processing unit 15 to the wireless network 2. The communication interface 11 sends a packet input from the wireless network 2 to the communication processing unit 15. In the present embodiment, the communication terminal 1 includes two communication interfaces 11a and 11b, the communication interface 11a corresponds to the wireless network 2a, and the communication interface 11b corresponds to the wireless network 2b. When it is not necessary to distinguish between the communication interfaces 11a and 11b, the communication interfaces 11a and 11b are referred to as “communication interface 11”. The communication terminal 1 may include three or more communication interfaces 11. The communication interface 11 is, for example, a wireless LAN module or a wireless modem module. However, the communication interface 11 is not limited to these examples.
　データ授受部１２は、通信ソフトウェア基本部１３に通信プロトコルおよび宛先を指定し、通信ソフトウェア基本部１３との間でデータを授受する。通信ソフトウェア基本部１３は、このデータに基づいてパケットを生成する。通信端末１は、サーバ４との間でパケットを送受信することにより、サーバ４との間でデータをやり取りする。また、データ授受部１２は、通信プロトコルの種別によっては、通信ソフトウェア基本部１３に対し、サーバ４との間でパケットを送受信するための接続処理を指示する。また、データ授受部１２はサーバ４と通信を行う際、名前解決部１７に対して、サーバ４の名前を含む名前解決要求データを入力し、サーバ４のアドレスを含む名前解決応答データを受信することで、サーバ４のアドレスを取得する。本実施形態では、通信端末１が２つのデータ授受部１２ａ，１２ｂを備えているものとして説明する。データ授受部１２ａ，１２ｂを区別する必要がない場合には、「データ授受部１２」と記す。通信端末１は、３つ以上のデータ授受部１２を備えていてもよい。 The data exchanging unit 12 designates a communication protocol and a destination in the communication software basic unit 13, and exchanges data with the communication software basic unit 13. The communication software basic unit 13 generates a packet based on this data. The communication terminal 1 exchanges data with the server 4 by transmitting and receiving packets to and from the server 4. In addition, depending on the type of communication protocol, the data transfer unit 12 instructs the communication software basic unit 13 to perform connection processing for transmitting and receiving packets to and from the server 4. Further, when communicating with the server 4, the data transfer unit 12 inputs name resolution request data including the name of the server 4 to the name resolution unit 17 and receives name resolution response data including the address of the server 4. Thus, the address of the server 4 is acquired. In the present embodiment, the communication terminal 1 will be described as including two data transfer units 12a and 12b. When it is not necessary to distinguish between the data transfer units 12a and 12b, the data transfer unit 12a is described as “data transfer unit 12”. The communication terminal 1 may include three or more data transfer units 12.
　データ授受部１２は、例えば、Ｗｅｂブラウザ等のプログラムに従って動作するコンピュータのＣＰＵ（Central Processing Unit）によって実現される。例えば、通信端末１は、プログラムを記憶するプログラム記憶装置（非図示）を備え、ＣＰＵは、プログラム記憶装置からプログラムを読み込んで、そのプログラムに従って、データ授受部１２として動作するようにしてもよい。ＣＰＵにデータ授受部１２としての機能を実現させるプログラムはＷｅｂブラウザに限定されず、他のプログラムであってもよい。 The data transfer unit 12 is realized by a CPU (Central Processing Unit) of a computer that operates according to a program such as a Web browser, for example. For example, the communication terminal 1 may include a program storage device (not shown) that stores a program, and the CPU may read the program from the program storage device and operate as the data transfer unit 12 according to the program. The program that causes the CPU to realize the function as the data transfer unit 12 is not limited to the Web browser, and may be another program.
　通信ソフトウェア基本部１３は、データ授受部１２から入力されたデータに基づいて、パケットを生成する。また、通信ソフトウェア基本部１３は、サーバ４から受信したパケットを受け取ると、パケットからデータを抽出してデータ授受部１２に送出する。 The communication software basic unit 13 generates a packet based on the data input from the data transfer unit 12. In addition, when receiving the packet received from the server 4, the communication software basic unit 13 extracts data from the packet and sends it to the data transfer unit 12.
　通信ソフトウェア基本部１３は、データ授受部１２からデータを受け付けると、通信ソフトウェア基本部１３に予め設定されている通信転送ルールに従って送信元アドレスを決定する。また、通信ソフトウェア基本部１３は、データ授受部１２から入力されたデータに基づいて、その送信元アドレスと、データ授受部１２によって指定された送信先アドレスとをヘッダ内に含むパケットを生成する。通信ソフトウェア基本部１３は、生成したパケットを、通信転送ルールに従って通信処理部１５に送る。本実施形態では、通信転送ルールのデフォルト設定において、通信ソフトウェア基本部１３は生成したパケットを通信処理部１５に送ることが規定されているものとする。 When the communication software basic unit 13 receives data from the data sending / receiving unit 12, the communication software basic unit 13 determines a source address according to a communication transfer rule preset in the communication software basic unit 13. Further, the communication software basic unit 13 generates a packet including the transmission source address and the transmission destination address designated by the data transmission / reception unit 12 in the header based on the data input from the data transmission / reception unit 12. The communication software basic unit 13 sends the generated packet to the communication processing unit 15 according to the communication transfer rule. In the present embodiment, it is assumed that the default setting of the communication transfer rule specifies that the communication software basic unit 13 sends the generated packet to the communication processing unit 15.
　また、通信ソフトウェア基本部１３は、サーバ４との間でパケットを送受信するための接続処理をデータ授受部１２によって指示された場合、前述の送信元アドレスおよび送信先アドレスをヘッダ内に含むパケットを、通信処理部１５を介して、サーバ４に送信する。通信ソフトウェア基本部１３は、このパケットを送信することにより、サーバ４との接続のための手続を実現する。 In addition, when the data transfer unit 12 instructs the communication software basic unit 13 to perform a connection process for transmitting / receiving a packet to / from the server 4, the communication software basic unit 13 includes a packet including the above-described transmission source address and transmission destination address in the header. The data is transmitted to the server 4 via the communication processing unit 15. The communication software basic unit 13 realizes a procedure for connection with the server 4 by transmitting this packet.
　通信ソフトウェア基本部１３は、例えば、オペレーティングシステム（ＯＳ）のカーネルに実装されているＴＣＰ（Transmission Control Protocol）／ＩＰ（Internet Protocol）スタックに従って動作するコンピュータのＣＰＵによって実現される。例えば、ＣＰＵは、プログラム記憶装置（非図示）からプログラム（上記の例では、ＴＣＰ／ＩＰスタック）を読み込んで、そのプログラムに従って、通信ソフトウェア基本部１３として動作するようにしてもよい。また、通信ソフトウェア基本部１３に設定される通信転送ルールは、例えば、ＩＰルーティング設定である。また、宛先との接続処理が必要とされるプロトコルとして、例えばＴＣＰが挙げられるが、ＴＣＰ以外のプロトコルを用いてもよい。 The communication software basic unit 13 is realized, for example, by a CPU of a computer that operates according to a TCP (Transmission Control Protocol) / IP (Internet Protocol) stack implemented in an operating system (OS) kernel. For example, the CPU may read a program (in the above example, a TCP / IP stack) from a program storage device (not shown) and operate as the communication software basic unit 13 according to the program. The communication transfer rule set in the communication software basic unit 13 is, for example, IP routing setting. Further, as a protocol that requires connection processing with a destination, for example, TCP can be mentioned, but a protocol other than TCP may be used.
　制御部１４は、設定記憶部１６に対し、データ授受部１２のそれぞれに１対１に対応し、アドレスの形態（例えば、アドレスと同一のフォーマット）を有する値を設定する。制御部１４は、名前解決部１７による名前解決要求データを含む名前解決パケットに含まれる宛先アドレスと名前解決要求データを利用して、名前解決要求元のデータ授受部１２と、要求されているサーバ４の名前を特定する。制御部１４は、特定したデータ授受部１２およびサーバ４の名前とポリシを照合し、ポリシに指定された通信インタフェース１１を用いると共に、当該通信インタフェース１１に対応付けられた名前解決サーバへ名前解決要求データを送信することを決定する。 The control unit 14 sets a value having a one-to-one correspondence with each of the data transfer units 12 in the setting storage unit 16 and having an address form (for example, the same format as the address). The control unit 14 uses the destination address and the name resolution request data included in the name resolution packet including the name resolution request data by the name resolution unit 17, and the requested data exchange unit 12 and the requested server. Specify the name of 4. The control unit 14 collates the name and policy of the specified data transfer unit 12 and server 4, uses the communication interface 11 specified in the policy, and sends a name resolution request to the name resolution server associated with the communication interface 11. Decide to send data.
　制御部１４は、例えば、アドレスの形態を有する値ＡおよびＢを、それぞれデータ授受部１２ａおよび１２ｂと１対１に対応付けて設定記憶部１６に記憶させる。図３は、設定記憶部１６が記憶するテーブルを例示する。本実施形態では、この例を用いて説明する。なお、値ＡおよびＢは名前解決サーバ５のアドレスと一致していなくてもよく、例えば、架空のアドレスであってもよいが、通信ソフトウェア基本部１３から通信処理部１５に送られる値とする。 The control unit 14 stores the values A and B having the address form in the setting storage unit 16 in a one-to-one correspondence with the data transfer units 12a and 12b, for example. FIG. 3 illustrates a table stored in the setting storage unit 16. This embodiment will be described using this example. The values A and B do not have to match the address of the name resolution server 5, and may be, for example, fictitious addresses, but are values sent from the communication software basic unit 13 to the communication processing unit 15. .
　制御部１４がデータ授受部１２とアドレスの形態を有する値を対応付けて設定記憶部１６に記憶させるとき、データ授受部１２の識別子とアドレスの形態を有する値を記憶させてもよい。データ授受部１２の識別子は、例えば、データ授受部１２のプロセス識別子（ＰＩＤ：Process Identifier）や、ユーザ識別子（ＵＩＤ：User Identifier）、グループ識別子（ＧＩＤ：Group Identifier）、名前などである。ただし、本発明において、データ授受部１２の識別子は、これらの例に限定されない。ＰＩＤのようにデータ授受部１２の起動ごとに変化するものを識別子として使用する場合には、制御部１４は、データ授受部１２の起動を監視し、データ授受部１２が起動するごとに、データ授受部１２の識別子とアドレスの形態を有する値を設定記憶部１６に記憶させる。 When the control unit 14 associates the data transmission / reception unit 12 with a value having an address form and stores it in the setting storage unit 16, the identifier of the data transmission / reception unit 12 and a value having an address form may be stored. The identifier of the data exchange unit 12 is, for example, a process identifier (PID: Process Identifier), a user identifier (UID: User Identifier), a group identifier (GID: Group Identifier), a name, or the like. However, in the present invention, the identifier of the data transfer unit 12 is not limited to these examples. When an identifier that changes with each activation of the data exchange unit 12 such as a PID is used as an identifier, the control unit 14 monitors the activation of the data exchange unit 12, and every time the data exchange unit 12 is activated, A value having the identifier and address form of the sending / receiving unit 12 is stored in the setting storage unit 16.
　制御部１４は、パケットに対する通信処理を決定する。ここで、「通信処理を決定する」とは、具体的には、パケットの送り先となる通信端末１内の機能ブロックと、書き換えるべきパケットヘッダのフィールドと、パケットヘッダの値を決定することを意味する。 The control unit 14 determines communication processing for the packet. Here, “determining communication processing” specifically means determining a functional block in the communication terminal 1 that is a packet destination, a packet header field to be rewritten, and a packet header value. To do.
　制御部１４は、内部の記憶領域に、少なくとも、データ授受部と、サーバ名と、使用無線ネットワークとを指定するポリシを保持する。図４は、本実施形態におけるポリシを例示する。図４に示した例では、データ授受部１２ａによるサーバ４ａ宛ての通信に対して無線ネットワーク２ａを使用するポリシ（「ポリシ１」という。）と、データ授受部１２ｂによるサーバ４ｂ宛ての通信に対して無線ネットワーク２ｂを使用するポリシ（「ポリシ２」という。）が含まれている。各ポリシには、優先度を設定できるようにしてもよい。本実施形態では、優先度を設定する場合について説明する。なお、各ポリシに優先度を設定しない場合には、例えば、ポリシの並び順によって優先度が規定されるようにしてもよい。また、使用無線ネットワークとして複数の無線ネットワークを指定できるようにしてもよい。複数の無線ネットワークを指定する場合には、いずれか１つの無線ネットワークが選択される。データ授受部の項目やサーバ名の項目には、ワイルドカードが指定されていてもよい。 The control unit 14 stores at least a policy for designating a data transfer unit, a server name, and a wireless network used in an internal storage area. FIG. 4 illustrates a policy in the present embodiment. In the example shown in FIG. 4, a policy using the wireless network 2a for communication addressed to the server 4a by the data transfer unit 12a (referred to as "policy 1") and a communication addressed to the server 4b by the data transfer unit 12b. The policy that uses the wireless network 2b (referred to as "policy 2") is included. A priority may be set for each policy. In the present embodiment, a case where priority is set will be described. In the case where the priority is not set for each policy, for example, the priority may be defined by the arrangement order of the policies. Further, a plurality of wireless networks may be designated as the wireless network to be used. When designating a plurality of wireless networks, any one of the wireless networks is selected. Wildcards may be specified in the data exchange section item and server name item.
　制御部１４は、名前解決部１７が名前解決要求データを通信ソフトウェア基本部１３に送信することにより生成されたパケットに対する通信処理を決定する際に、以下の処理を行う。制御部１４は、通信ソフトウェア基本部１３を参照し、通信インタフェース１１のアドレスを取得する。また、制御部１４は、設定記憶部１６が保持する情報（例えば、図３のテーブル）を参照して、当該パケットの宛先アドレスから、名前解決要求元のデータ授受部１２を特定する。さらに、制御部１４は設定記憶部１６を参照し、名前解決サーバ５のアドレスを取得する。また、制御部１４は、当該パケットから、要求されているサーバ４の名前を特定する。さらに、制御部１４は、特定したデータ授受部１２とサーバ４の名前をポリシと照合し、当該パケットに対する通信処理を決定する。 The control unit 14 performs the following process when the name resolution unit 17 determines the communication process for the packet generated by transmitting the name resolution request data to the communication software basic unit 13. The control unit 14 refers to the communication software basic unit 13 and acquires the address of the communication interface 11. Further, the control unit 14 refers to the information held in the setting storage unit 16 (for example, the table of FIG. 3), and identifies the data exchange unit 12 that is the name resolution request source from the destination address of the packet. Further, the control unit 14 refers to the setting storage unit 16 and acquires the address of the name resolution server 5. Further, the control unit 14 specifies the name of the requested server 4 from the packet. Further, the control unit 14 collates the identified data exchange unit 12 and the name of the server 4 with the policy, and determines a communication process for the packet.
　データ授受部１２ａがサーバ４ａの名前解決を名前解決部１７に要求する場合について説明する。データ授受部１２ａがサーバ４ａの名前解決を名前解決部１７に要求すると、制御部１４は、名前解決部１７および通信ソフトウェア基本部１３を経由し、通信処理部１５から、宛先アドレスに値Ａが指定され、サーバ４ａの名前によってアドレスを要求する名前解決要求パケットを受け付ける。 The case where the data transfer unit 12a requests the name resolution unit 17 to resolve the name of the server 4a will be described. When the data exchanging unit 12a requests the name resolution unit 17 to resolve the name of the server 4a, the control unit 14 passes the name resolution unit 17 and the communication software basic unit 13, and the value A is sent to the destination address from the communication processing unit 15. A name resolution request packet that is designated and requests an address by the name of the server 4a is accepted.
　制御部１４は、設定記憶部１６が保持する情報（図３）を参照し、宛先アドレスに指定された値Ａに基づいて、名前解決要求元をデータ授受部１２ａであると特定する。また、制御部１４は、当該パケットを参照し、サーバ４ａの名前を取得する。さらに、制御部１４は、データ授受部１２ａとサーバ４ａの名前をポリシ（図４）と照合して、ポリシ１と一致することを判別する。また、制御部１４は、ポリシ１の内容をもとに、通信インタフェース１１ａに対応する名前解決サーバ５ａのアドレスを、設定記憶部１６を参照して取得する。制御部１４は、当該パケットに対する通信処理として、送信元アドレスを通信インタフェース１１ａのアドレスに書き換え、宛先アドレスを名前解決サーバ５ａのアドレスに書き換え、通信インタフェース１１ａに出力する処理を決定し、通信処理部１５に当該通信処理の実行を指示する。このとき、制御部１４は、名前解決要求パケットの送信元ポート番号と、値Ａまたはデータ授受部１２ａの識別子を保持する。 The control unit 14 refers to the information held in the setting storage unit 16 (FIG. 3), and identifies the name resolution request source as the data transfer unit 12a based on the value A specified in the destination address. Also, the control unit 14 refers to the packet and acquires the name of the server 4a. Further, the control unit 14 compares the names of the data transmission / reception unit 12a and the server 4a with the policy (FIG. 4) and determines that it matches the policy 1. Further, the control unit 14 acquires the address of the name resolution server 5 a corresponding to the communication interface 11 a with reference to the setting storage unit 16 based on the contents of the policy 1. As a communication process for the packet, the control unit 14 rewrites the source address to the address of the communication interface 11a, rewrites the destination address to the address of the name resolution server 5a, and determines a process to output to the communication interface 11a. 15 is instructed to execute the communication process. At this time, the control unit 14 holds the source port number of the name resolution request packet and the value A or the identifier of the data transfer unit 12a.
　図５は、制御部１４が保持するテーブルを例示する図である。図５（ａ）は、ポート番号ｎａ，ｎｂと値Ａ，Ｂとを対応付けて保持する場合のテーブルを示す。一方、図５（ｂ）は、ポート番号ｎａ，ｎｂとデータ授受部１２ａ，１２ｂの識別子とを対応付けて保持する場合のテーブルを示す。以下では、図５（ａ）のように、ポート番号ｎａ，ｎｂと対応付けて値Ａ，Ｂを保存する場合について説明する。なお、ポート番号ｎａ，ｎｂと対応付けてデータ授受部１２ａ，１２ｂの識別子を保存した場合、制御部１４は設定記憶部１６が保持する情報（図３）をさらに参照することで、値Ａを取得することができる。 FIG. 5 is a diagram illustrating a table held by the control unit 14. FIG. 5A shows a table when the port numbers na and nb and the values A and B are held in association with each other. On the other hand, FIG. 5B shows a table when the port numbers na and nb are associated with the identifiers of the data transfer units 12a and 12b. Hereinafter, a case where the values A and B are stored in association with the port numbers na and nb as shown in FIG. When the identifiers of the data transfer units 12a and 12b are stored in association with the port numbers na and nb, the control unit 14 further refers to the information held in the setting storage unit 16 (FIG. 3), so that the value A is set. Can be acquired.
　次に、通信端末１が、名前解決要求パケットに対応する名前解決応答パケットを受信する場合について説明する。制御部１４は、通信インタフェース１１ａを経由して、通信処理部１５から、名前解決応答パケットを受信する。制御部１４は、宛先ポート番号から、保存した値Ａを取得する。次に、制御部１４は、通信処理として、宛先アドレスを通信処理部１５のアドレスに書き換え、送信元アドレスを値Ａに書き換え、通信ソフトウェア基本部１３に出力する処理を決定し、通信処理部１５に当該通信処理の実行を指示する。 Next, a case where the communication terminal 1 receives a name resolution response packet corresponding to the name resolution request packet will be described. The control unit 14 receives a name resolution response packet from the communication processing unit 15 via the communication interface 11a. The control unit 14 acquires the stored value A from the destination port number. Next, as a communication process, the control unit 14 rewrites the destination address with the address of the communication processing unit 15, rewrites the transmission source address with the value A, and determines a process to be output to the communication software basic unit 13. Is instructed to execute the communication process.
　制御部１４は、例えば、オープンフロー（非特許文献５、６）におけるオープンフローコントローラ（ＯＦＣ：OpenFlow Controller）である。ただし、制御部１４は、ＯＦＣに限定されない。制御部１４は、例えば、プログラムに従って動作するコンピュータのＣＰＵによって実現される。例えば、ＣＰＵがプログラム記憶装置（図示略）からプログラムを読み込んで、そのプログラムに従って、制御部１４として動作するようにしてもよい。 The control unit 14 is, for example, an open flow controller (OFC: OpenFlow Controller) in OpenFlow (Non-Patent Documents 5 and 6). However, the control unit 14 is not limited to the OFC. The control unit 14 is realized by a CPU of a computer that operates according to a program, for example. For example, the CPU may read a program from a program storage device (not shown) and operate as the control unit 14 according to the program.
　通信処理部１５は、制御部１４に設定された０個以上の通信処理ルール、および、制御部１４からの通信処理の実行指示に基づいて、入力されたパケットに対する処理を実行する。例えば、通信処理部１５は、パケットのヘッダを書き換えたり、パケットを通信端末１内の他の機能ブロックに転送したりする。通信処理部１５は、通信ソフトウェア基本部１３から入力されたパケットＰに関しては、制御部１４による制御に従って、例えば、ヘッダ内の送信元アドレスを通信インタフェース１１ａのアドレスに書き換え、パケットＰを通信インタフェース１１ａに送る。一方、通信処理部１５は、通信インタフェース１１で受信されたパケットＱに関しては、制御部１４による制御に従って、例えば、ヘッダ内の送信先アドレスを通信処理部１５のアドレスに書き換え、通信ソフトウェア基本部１３に送る。また、通信処理部１５に設定されたいずれの通信処理ルールにも合致しないパケットや、制御部１４へのパケット転送を規定した通信処理ルールに合致するパケットに関しては、通信処理部１５は、制御部１４に転送する。 The communication processing unit 15 executes processing on the input packet based on zero or more communication processing rules set in the control unit 14 and the communication processing execution instruction from the control unit 14. For example, the communication processing unit 15 rewrites the header of the packet or transfers the packet to another functional block in the communication terminal 1. For the packet P input from the communication software basic unit 13, for example, the communication processing unit 15 rewrites the source address in the header with the address of the communication interface 11a according to the control of the control unit 14, and converts the packet P into the communication interface 11a. Send to. On the other hand, the communication processing unit 15 rewrites, for example, the transmission destination address in the header with the address of the communication processing unit 15 according to the control by the control unit 14 with respect to the packet Q received by the communication interface 11, and the communication software basic unit 13 Send to. For packets that do not match any communication processing rule set in the communication processing unit 15 or packets that match a communication processing rule that defines packet transfer to the control unit 14, the communication processing unit 15 14 for transfer.
　通信処理部１５は、例えば、オープンフロー（非特許文献５、６）におけるオープンフロースイッチ（ＯＦＳ：OpenFlow Switch）である。通信処理部１５がＯＦＳである場合、通信処理部１５自身のアドレスは、ＯＦＳのローカルポート（Local Port）に付けられるか、ＯＦＳと通信ソフトウェア基本部１３に接続される仮想イーサネット（登録商標）デバイスに付けられる。ただし、通信処理部１５は、ＯＦＳに限定されない。また、通信処理部１５は、例えば、プログラムに従って動作するコンピュータのＣＰＵによって実現されてもよい。例えば、ＣＰＵがプログラム記憶装置（図示略）からプログラムを読み込んで、そのプログラムに従って、通信処理部１５として動作するようにしてもよい。 The communication processing unit 15 is, for example, an open flow switch (OFS: OpenFlow Switch) in OpenFlow (Non-Patent Documents 5 and 6). When the communication processing unit 15 is OFS, the address of the communication processing unit 15 itself is attached to the local port (Local Port) of the OFS, or a virtual Ethernet (registered trademark) device connected to the OFS and the communication software basic unit 13 It is attached to. However, the communication processing unit 15 is not limited to OFS. The communication processing unit 15 may be realized by a CPU of a computer that operates according to a program, for example. For example, the CPU may read a program from a program storage device (not shown) and operate as the communication processing unit 15 according to the program.
　設定記憶部１６は、通信インタフェース１１と名前解決サーバ５のアドレスとの対応関係と、データ授受部１２とアドレスの形態を有する値との対応関係を記憶する記憶装置である。図６は、設定記憶部１６が保持するテーブルを例示する。例えば、名前解決サーバ５ａは、通信インタフェース１１ａに対応する無線ネットワーク２ａに接続されている。したがって、図６に示すように、設定記憶部１６は、通信インタフェース１１ａと、名前解決サーバ５ａのアドレスとを対応付けて記憶する。同様に、設定記憶部１６は、通信インタフェース１１ｂと、名前解決サーバ５ｂのアドレスとを対応付けて記憶する。また、図３に示したように、設定記憶部１６は、データ授受部１２ａに対応する値として値Ａを記憶し、データ授受部１２ｂに対応する値として値Ｂを記憶する。設定記憶部１６は、通信インタフェース１１と名前解決サーバ５のアドレスとの対応関係を、例えば、ファイルあるいはデータベースとして記憶してもよく、その他の態様で記憶してもよい。 The setting storage unit 16 is a storage device that stores the correspondence between the communication interface 11 and the address of the name resolution server 5 and the correspondence between the data transfer unit 12 and a value having an address form. FIG. 6 illustrates a table held by the setting storage unit 16. For example, the name resolution server 5a is connected to the wireless network 2a corresponding to the communication interface 11a. Therefore, as shown in FIG. 6, the setting storage unit 16 stores the communication interface 11a and the address of the name resolution server 5a in association with each other. Similarly, the setting storage unit 16 stores the communication interface 11b and the address of the name resolution server 5b in association with each other. Further, as shown in FIG. 3, the setting storage unit 16 stores the value A as a value corresponding to the data transfer unit 12a and stores the value B as a value corresponding to the data transfer unit 12b. The setting storage unit 16 may store the correspondence relationship between the communication interface 11 and the address of the name resolution server 5 as, for example, a file or a database, or may store it in another manner.
　設定記憶部１６は、例えば、非特許文献４に記載されたオペレーティングシステム（ＯＳ）の設定データベースである。ただし、設定記憶部１６はこの例に限られない。 The setting storage unit 16 is, for example, an operating system (OS) setting database described in Non-Patent Document 4. However, the setting storage unit 16 is not limited to this example.
　名前解決部１７は、データ授受部１２からサーバ４の名前を含む名前解決要求データが入力されると、要求元のデータ授受部１２の情報を元に、設定記憶部１６を参照してアドレスを取得する。例えば、データ授受部１２ａから名前解決要求データを入力されると、名前解決部１７は、アドレスとして値Ａを取得する。そして、名前解決部１７は、取得した値Ａをアドレスとして指定して、名前解決要求データを通信ソフトウェア基本部１３に送出する。 When the name resolution request data including the name of the server 4 is input from the data exchange unit 12, the name resolution unit 17 refers to the setting storage unit 16 based on the information of the data exchange unit 12 of the request source. get. For example, when name resolution request data is input from the data transfer unit 12a, the name resolution unit 17 acquires a value A as an address. Then, the name resolution unit 17 designates the acquired value A as an address, and sends name resolution request data to the communication software basic unit 13.
　名前解決部１７は、例えば、ＤＮＳリゾルバ等のプログラムに従って動作するコンピュータのＣＰＵによって実現される。例えば、ＣＰＵがプログラム記憶装置からプログラムを読み込んで、そのプログラムに従って名前解決部１７として動作するようにしてもよい。当該プログラムは、例えば、非特許文献４に記載されたＯＳで実装されているＤＮＳリゾルバである。なお、本発明はこの例に限られず、アプリケーションやプロセスごとに設定記憶部１６からアドレスを取得し、取得したアドレスを指定して名前解決要求を送出するようなプログラムであればよい。 The name resolution unit 17 is realized by a CPU of a computer that operates according to a program such as a DNS resolver, for example. For example, the CPU may read a program from a program storage device and operate as the name resolution unit 17 according to the program. The program is, for example, a DNS resolver implemented by an OS described in Non-Patent Document 4. The present invention is not limited to this example, and any program may be used as long as it acquires an address from the setting storage unit 16 for each application or process, designates the acquired address, and sends a name resolution request.
　次に、本実施形態に係る通信端末１の動作について、図面を参照して説明する。図７は、データ授受部１２ａがサーバ４ａの名前解決要求を行う場合の動作を示すシーケンス図である。 Next, the operation of the communication terminal 1 according to this embodiment will be described with reference to the drawings. FIG. 7 is a sequence diagram showing an operation when the data transfer unit 12a makes a name resolution request of the server 4a.
　データ授受部１２ａ（図７において非図示）が名前解決部１７に対して、サーバ４の名前を含む名前解決要求データを入力する。すると、名前解決部１７は、データ授受部１２ａがデータを入力したことをもとに、設定記憶部１６を参照して値Ａを取得する。名前解決部１７は、選択した名前解決サーバ５ａのアドレスを指定して、名前解決要求データを通信ソフトウェア基本部１３に送る（ステップＳ１）。 The data transfer unit 12a (not shown in FIG. 7) inputs name resolution request data including the name of the server 4 to the name resolution unit 17. Then, the name resolution unit 17 acquires the value A with reference to the setting storage unit 16 based on the data input by the data transfer unit 12a. The name resolution unit 17 designates the address of the selected name resolution server 5a, and sends name resolution request data to the communication software basic unit 13 (step S1).
　次に、通信ソフトウェア基本部１３は、通信転送ルールに従って、通信処理部１５のアドレスを名前解決要求パケットの送信元アドレスとして決定する。通信ソフトウェア基本部１３は、その送信元アドレスを含み、さらに、名前解決部１７に指定された値Ａを送信先アドレスとして含むヘッダを有する名前解決要求パケットを、名前解決要求データに基づいて生成する。通信ソフトウェア基本部１３は、生成された名前解決要求パケットを通信処理部１５に送る（ステップＳ２）。 Next, the communication software basic unit 13 determines the address of the communication processing unit 15 as the source address of the name resolution request packet according to the communication transfer rule. The communication software basic unit 13 generates a name resolution request packet including the transmission source address and having a header including the value A specified by the name resolution unit 17 as a transmission destination address based on the name resolution request data. . The communication software basic unit 13 sends the generated name resolution request packet to the communication processing unit 15 (step S2).
　次に、通信処理部１５は、通信ソフトウェア基本部１３から入力された名前解決要求パケットと通信処理ルールを照合し、名前解決要求パケットに合致する通信処理ルールが存在しないか、あるいは、制御部１４へのパケット転送を規定した通信処理ルールに名前解決要求パケットが合致している場合、名前解決要求パケットを制御部１４に送る（ステップＳ３）。本実施形態では、名前解決要求パケットに合致する通信処理ルールが存在しない場合について説明する。 Next, the communication processing unit 15 collates the name resolution request packet input from the communication software basic unit 13 with the communication processing rule, and there is no communication processing rule that matches the name resolution request packet, or the control unit 14 If the name resolution request packet matches the communication processing rule that defines the packet transfer to the server, the name resolution request packet is sent to the control unit 14 (step S3). In the present embodiment, a case where there is no communication processing rule that matches the name resolution request packet will be described.
　次に、制御部１４は、名前解決要求パケットの通信処理の実行を通信処理部１５に指示する（ステップＳ４）。図８は、ステップＳ４における制御部１４の処理の詳細を例示するフロー図である。 Next, the control unit 14 instructs the communication processing unit 15 to execute the communication processing of the name resolution request packet (step S4). FIG. 8 is a flowchart illustrating details of the processing of the control unit 14 in step S4.
　図８を参照すると、制御部１４は、通信処理部１５から名前解決要求パケットを受け付ける（ステップＳ４１）。 Referring to FIG. 8, the control unit 14 receives a name resolution request packet from the communication processing unit 15 (step S41).
　次に、制御部１４は、設定記憶部１６を参照し、名前解決要求パケットのヘッダに含まれる宛先アドレスの値Ａから、名前解決要求パケットの名前解決要求元をデータ授受部１２ａであると特定する（ステップＳ４２）。 Next, the control unit 14 refers to the setting storage unit 16 and identifies the name resolution request source of the name resolution request packet as the data transfer unit 12a from the value A of the destination address included in the header of the name resolution request packet. (Step S42).
　次に、制御部１４は、名前解決要求パケットを解析し、ペイロードに含まれるサーバ４ａの名前を抽出する（ステップＳ４３）。 Next, the control unit 14 analyzes the name resolution request packet and extracts the name of the server 4a included in the payload (step S43).
　次に、制御部１４は、ステップＳ４２で特定した、名前解決要求元がデータ授受部１２ａであるという情報と、ステップＳ４３で抽出したサーバ４ａの名前とを、ポリシ（図４参照）と照合し、名前解決要求パケットの出力先として、通信インタフェース１１ａを決定する（ステップＳ４４）。 Next, the control unit 14 collates the information specified in step S42 that the name resolution request source is the data transfer unit 12a and the name of the server 4a extracted in step S43 with a policy (see FIG. 4). The communication interface 11a is determined as the output destination of the name resolution request packet (step S44).
　次に、制御部１４は、設定記憶部１６を参照し、通信インタフェース１１ａに対応する名前解決サーバ５ａのアドレスを取得する（ステップＳ４５）。 Next, the control unit 14 refers to the setting storage unit 16 and acquires the address of the name resolution server 5a corresponding to the communication interface 11a (step S45).
　次に、制御部１４は、名前解決要求パケットの送信元アドレスを通信インタフェース１１ａのアドレスに書き換え、宛先アドレスを名前解決サーバ５ａのアドレスに書き換え、通信インタフェース１１ａに出力する処理を実行するように、通信処理部１５に指示する（ステップＳ４６）。 Next, the control unit 14 rewrites the source address of the name resolution request packet to the address of the communication interface 11a, rewrites the destination address to the address of the name resolution server 5a, and executes processing to output to the communication interface 11a. The communication processing unit 15 is instructed (step S46).
　次に、制御部１４は、名前解決要求パケットの送信元ポート番号と値Ａとを対応付けて、制御部１４の記憶領域に保存する（ステップＳ４７）。 Next, the control unit 14 associates the transmission source port number of the name resolution request packet with the value A and stores them in the storage area of the control unit 14 (step S47).
　図７に戻ると、通信処理部１５は、制御部１４によって指示された上記の処理を実行する（ステップＳ５）。 Returning to FIG. 7, the communication processing unit 15 executes the above-described processing instructed by the control unit 14 (step S5).
　次に、通信インタフェース１１ａは、名前解決要求パケットを図７には図示しない無線ネットワーク２ａに出力する（ステップＳ６）。以上により、名前解決要求パケットは名前解決サーバ５ａに送信される。 Next, the communication interface 11a outputs a name resolution request packet to the wireless network 2a (not shown in FIG. 7) (step S6). As described above, the name resolution request packet is transmitted to the name resolution server 5a.
　次に、通信インタフェース１１ａは、名前解決サーバ５ａから送信された名前解決応答パケットを、無線ネットワーク２ａを介して受信し、通信処理部１５に送る（ステップＳ１１）。 Next, the communication interface 11a receives the name resolution response packet transmitted from the name resolution server 5a via the wireless network 2a and sends it to the communication processing unit 15 (step S11).
　次に、通信処理部１５は、通信インタフェース１１ａから入力された名前解決応答パケットと通信処理ルールとを照合し、名前解決応答パケットに合致する通信処理ルールが存在しないか、あるいは、制御部１４へのパケット転送を規定した通信処理ルールに名前解決応答パケットが合致している場合、名前解決応答パケットを制御部１４に送る（ステップＳ１２）。本実施形態では、名前解決応答パケットに合致する通信処理ルールが存在しない場合について説明する。 Next, the communication processing unit 15 collates the name resolution response packet input from the communication interface 11a with the communication processing rule, and there is no communication processing rule that matches the name resolution response packet, or the control unit 14 If the name resolution response packet matches the communication processing rule that defines the packet transfer, the name resolution response packet is sent to the control unit 14 (step S12). In the present embodiment, a case where there is no communication processing rule that matches the name resolution response packet will be described.
　次に、制御部１４は、名前解決応答パケットに対する処理の実行を通信処理部１５に指示する（ステップＳ１３）。図９は、ステップＳ１３における制御部１４の処理の詳細を例示するフロー図である。 Next, the control unit 14 instructs the communication processing unit 15 to execute processing for the name resolution response packet (step S13). FIG. 9 is a flowchart illustrating the details of the processing of the control unit 14 in step S13.
　図９を参照すると、制御部１４は、通信処理部１５から名前解決応答パケットを受け付ける（ステップＳ１３１）。 Referring to FIG. 9, the control unit 14 receives a name resolution response packet from the communication processing unit 15 (step S131).
　次に、制御部１４は、自身の記憶領域を参照して、名前解決応答パケットの宛先ポート番号から、値Ａを取得する（ステップＳ１３２）。 Next, the control unit 14 refers to its own storage area and acquires the value A from the destination port number of the name resolution response packet (step S132).
　次に、制御部１４は、名前解決応答パケットの宛先アドレスを通信処理部１５のアドレスに書き換え、送信元アドレスを値Ａに書き換え、通信ソフトウェア基本部１３に出力する処理を、通信処理部１５に指示する（ステップＳ１３３）。すなわち、ステップＳ２で通信ソフトウェア基本部１３が生成した名前解決要求パケットと、ステップＳ１３３の指示により通信処理部１５が出力する名前解決応答パケットを比較すると、前記名前解決要求パケットの宛先アドレスと前記名前解決応答パケットの送信元アドレスとが一致し、前記名前解決要求パケットの送信元アドレスと前記名前解決応答パケットの宛先アドレスとが一致している。 Next, the control unit 14 rewrites the destination address of the name resolution response packet to the address of the communication processing unit 15, rewrites the transmission source address to the value A, and outputs the processing to the communication software basic unit 13 to the communication processing unit 15. An instruction is given (step S133). That is, when the name resolution request packet generated by the communication software basic unit 13 in step S2 is compared with the name resolution response packet output by the communication processing unit 15 according to the instruction in step S133, the destination address of the name resolution request packet and the name The source address of the resolution response packet matches, and the source address of the name resolution request packet matches the destination address of the name resolution response packet.
　次に、制御部１４は、当該宛先ポート番号と値Ａの組を、自身の記憶領域から削除する（ステップＳ１３４）。 Next, the control unit 14 deletes the set of the destination port number and the value A from its own storage area (step S134).
　図７に戻ると、通信処理部１５は、ステップＳ１３３で制御部１４に指示された通信処理を実行する（ステップＳ１４）。 Returning to FIG. 7, the communication processing unit 15 executes the communication process instructed by the control unit 14 in step S133 (step S14).
　次に、通信ソフトウェア基本部１３は、通信処理部１５から入力された名前解決応答パケットから名前解決応答データを抽出し、名前解決部１７に送る（ステップＳ１５）。この結果、名前解決部１７は、名前解決サーバ５ａから送信された名前解決応答データを取得し、その名前解決応答データをデータ授受部１２ａに送る（ステップＳ１６）。 Next, the communication software basic unit 13 extracts name resolution response data from the name resolution response packet input from the communication processing unit 15 and sends it to the name resolution unit 17 (step S15). As a result, the name resolution unit 17 acquires the name resolution response data transmitted from the name resolution server 5a, and sends the name resolution response data to the data transfer unit 12a (step S16).
　本実施形態に係る通信端末１によると、名前解決部１７が個別のデータ授受部１２のそれぞれに一意の宛先アドレスへ名前解決要求を送るように、制御部１４は設定記憶部１６に設定情報を記憶させる。また、制御部１４は、通信ソフトウェア基本部１３を経由した名前解決要求パケットを受信し、当該名前解決要求パケットの宛先アドレスから名前解決要求元のデータ授受部１２を特定する。これにより、制御部１４は、名前解決要求パケットに含まれるサーバ名とデータ授受部１２の識別子とを組み合わせてポリシと照合し、名前解決要求パケットを、ポリシに対応した無線ネットワーク２に接続された名前解決サーバ５に送信する。 According to the communication terminal 1 according to the present embodiment, the control unit 14 sends the setting information to the setting storage unit 16 so that the name resolution unit 17 sends a name resolution request to a unique destination address to each individual data transfer unit 12. Remember. Further, the control unit 14 receives the name resolution request packet via the communication software basic unit 13 and identifies the data transfer unit 12 that is the name resolution request source from the destination address of the name resolution request packet. As a result, the control unit 14 combines the server name included in the name resolution request packet with the identifier of the data transfer unit 12 to collate with the policy, and the name resolution request packet is connected to the wireless network 2 corresponding to the policy. It transmits to the name resolution server 5.
　また、本実施形態に係る通信端末１によれば、設定記憶部１６を参照し、データ授受部１２のそれぞれに対応したアドレスを宛先として、名前解決要求データを出力するという既存の名前解決部１７の特徴を利用している。したがって、既存の名前解決部１７自体に変更を加えることなく、従来の端末に対して制御部１４と通信処理部１５を追加し、設定記憶部１６に情報を記憶させることで、上述の本発明の課題を解決することが可能となる。 In addition, according to the communication terminal 1 according to the present embodiment, the existing name resolution unit 17 that refers to the setting storage unit 16 and outputs name resolution request data with addresses corresponding to the data transfer units 12 as destinations. The feature of is utilized. Therefore, by adding the control unit 14 and the communication processing unit 15 to the conventional terminal and storing the information in the setting storage unit 16 without changing the existing name resolution unit 17 itself, the above-described present invention is provided. This problem can be solved.
＜実施形態２＞
　次に、第２の実施形態に係る通信端末について、図面を参照して説明する。 <Embodiment 2>
Next, a communication terminal according to the second embodiment will be described with reference to the drawings.
　図１０は、本実施形態の通信端末を含む通信システムを例示する図である。 FIG. 10 is a diagram illustrating a communication system including the communication terminal of the present embodiment.
　図１０を参照すると、本実施形態の通信端末１が接続される通信システムにおいて、サーバ４ａ，４ｂ、無線ネットワーク２ａ，２ｂ、名前解決サーバ５ａ，５ｂおよび有線ネットワーク３は、それぞれ第１の実施形態におけるサーバ４、無線ネットワーク２ａ，２ｂおよび有線ネットワーク３と同様である。ただし、本実施形態の通信端末１が接続する通信システムでは、図１に示した第１の実施形態の通信端末が接続する通信システムに対して、さらに、ポリシサーバ６が追加されている。 Referring to FIG. 10, in the communication system to which the communication terminal 1 of this embodiment is connected, the servers 4a and 4b, the wireless networks 2a and 2b, the name resolution servers 5a and 5b, and the wired network 3 are respectively the first embodiment. The same as the server 4, the wireless networks 2 a and 2 b, and the wired network 3. However, in the communication system to which the communication terminal 1 of this embodiment is connected, a policy server 6 is further added to the communication system to which the communication terminal of the first embodiment shown in FIG. 1 is connected.
　ポリシサーバ６は、通信端末１にポリシを送信する。ポリシ送信の契機は、例えば、通信端末１の要求、所定の時間経過、または、図１０には図示しない装置の要求であってもよい。ただし、ポリシ送信の契機はこれらに限定されない。ポリシサーバ６は、例えば、ＡＮＤＳＦ（Access Network Discovery and Selection Function）サーバなどである。ただし、ポリシサーバ６は、ＡＮＤＳＦサーバに限定されない。 Policy server 6 transmits a policy to communication terminal 1. The trigger for the policy transmission may be, for example, a request from the communication terminal 1, a predetermined time, or a request from a device not shown in FIG. However, the trigger of policy transmission is not limited to these. The policy server 6 is, for example, an ANDSF (Access / Network / Discovery / Selection / Function) server. However, the policy server 6 is not limited to the ANDSF server.
　本実施形態の通信端末１の構成は、図２に示した第１の実施形態の通信端末１の構成と同様であるため、図示を省略する。 The configuration of the communication terminal 1 of the present embodiment is the same as that of the communication terminal 1 of the first embodiment shown in FIG.
　本実施形態に係る通信端末１の制御部１４は、第１実施形態の制御部１４と比較して、さらに、ポリシサーバ６からポリシを受信する点で相違する。 The control unit 14 of the communication terminal 1 according to the present embodiment is further different from the control unit 14 of the first embodiment in that it receives a policy from the policy server 6.
　本実施形態の通信端末１によれば、第１の実施形態の通信端末１によってもたらされる効果に加えて、さらに、外部装置からポリシを更新することが可能となる。 According to the communication terminal 1 of the present embodiment, in addition to the effects brought about by the communication terminal 1 of the first embodiment, it is possible to update the policy from an external device.
　なお、上記実施形態では、アドレスを例として説明してきたが、アドレスを送信元ポート番号などに置き換えて同様の制御を行うことも可能である。 In the above embodiment, the address has been described as an example, but the same control can be performed by replacing the address with a source port number or the like.
　本発明において、さらに、下記の形態が可能である。
［形態１］
　上記第１の態様に係る通信端末のとおりである。
［形態２］
　前記制御部は、前記設定記憶部を参照して前記パケットに含まれる識別子を付されたデータ授受部を特定すると共に、特定したデータ授受部と前記パケットに含まれる前記宛先装置を示す情報を前記所定のポリシに照合して前記複数の通信インタフェースの中から使用すべき通信インタフェースを決定する、形態１に記載の通信端末。
［形態３］
　前記所定のポリシは、前記データ授受部と前記宛先装置を示す情報と使用すべき通信インタフェースとの対応付けを含む、形態１または２に記載の通信端末。
［形態４］
　前記設定記憶部は、各通信インタフェースと対応する名前解決サーバのアドレスとを関連付けて保持し、
　前記制御部は、決定した通信インタフェースに対応する名前解決サーバのアドレスを前記設定記憶部に基づいて特定する、形態１ないし３のいずれか一に記載の通信端末。
［形態５］
　前記制御部は、前記所定のポリシをポリシサーバから受け付ける、形態１ないし４のいずれか一に記載の通信端末。
［形態６］
　前記制御部は、前記パケットの送信元ポート番号と前記データ授受部の識別子とを対応付けて保持し、前記パケットに対する応答パケットを受信すると、当該対応付けに基づいて、受信した応答パケットの宛先ポート番号に対応付けられたアドレスを特定し、
　前記通信処理部は、前記応答パケットの送信元アドレスを、前記制御部が特定したアドレスに変更して、前記通信ソフトウェア基本部に出力する、形態１ないし５のいずれか一に記載の通信端末。
［形態７］
　前記制御部は、受信した応答パケットの宛先ポート番号に対応付けられたアドレスを特定すると、前記保持する対応付けを削除する、形態６に記載の通信端末。
［形態８］
　上記第２の態様に係る通信方法のとおりである。
［形態９］
　前記通信端末が、前記設定記憶部を参照して前記パケットに含まれる識別子を付されたデータ授受部を特定する工程と、
　特定したデータ授受部と前記パケットに含まれる前記宛先装置を示す情報を前記所定のポリシに照合して、前記複数の通信インタフェースの中から使用すべき通信インタフェースを決定する工程と、を含む、形態８に記載の通信方法。
［形態１０］
　前記所定のポリシは、前記データ授受部と前記宛先装置を示す情報と使用すべき通信インタフェースとの対応付けを含む、形態８または９に記載の通信方法。
［形態１１］
　前記通信端末が、各通信インタフェースと対応する名前解決サーバのアドレスとを関連付けて前記設定記憶部に保持する工程と、
　前記決定した通信インタフェースに対応する名前解決サーバのアドレスを前記設定記憶部に基づいて特定する工程と、を含む、形態８ないし１０のいずれか一に記載の通信方法。
［形態１２］
　前記通信端末が、前記所定のポリシをポリシサーバから受け付ける工程を含む、形態８ないし１１のいずれか一に記載の通信方法。
［形態１３］
　前記通信端末が、前記パケットの送信元ポート番号と前記データ授受部の識別子とを対応付けて保持する工程と、
　前記パケットに対する応答パケットを受信すると、前記保持する対応付けに基づいて、受信した応答パケットの宛先ポート番号に対応付けられたアドレスを特定する工程と、
　前記応答パケットの送信元アドレスを、前記特定したアドレスに変更する工程と、を含む、形態８ないし１２のいずれか一に記載の通信方法。
［形態１４］
　前記通信端末が、受信した応答パケットの宛先ポート番号に対応付けられたアドレスを特定すると、前記保持する対応付けを削除する工程を含む、形態１３に記載の通信方法。
［形態１５］
　上記第３の態様に係るプログラムのとおりである。
［形態１６］
　前記設定記憶部を参照して前記パケットに含まれる識別子を付されたデータ授受部を特定する処理と、
　特定したデータ授受部と前記パケットに含まれる前記宛先装置を示す情報を前記所定のポリシに照合して、前記複数の通信インタフェースの中から使用すべき通信インタフェースを決定する処理と、を前記コンピュータに実行させる、形態１５に記載のプログラム。
［形態１７］
　前記所定のポリシは、前記データ授受部と前記宛先装置を示す情報と使用すべき通信インタフェースとの対応付けを含む、形態１５または１６に記載のプログラム。
［形態１８］
　各通信インタフェースと対応する名前解決サーバのアドレスとを関連付けて前記設定記憶部に保持する処理と、
　前記決定した通信インタフェースに対応する名前解決サーバのアドレスを前記設定記憶部に基づいて特定する処理と、を前記コンピュータに実行させる、形態１５ないし１７のいずれか一に記載のプログラム。
［形態１９］
　前記所定のポリシをポリシサーバから受け付ける処理を前記コンピュータに実行させる、形態１５ないし１８のいずれか一に記載のプログラム。
［形態２０］
　前記パケットの送信元ポート番号と前記データ授受部の識別子とを対応付けて保持する処理と、
　前記パケットに対する応答パケットを受信すると、前記保持する対応付けに基づいて、受信した応答パケットの宛先ポート番号に対応付けられたアドレスを特定する処理と、
　前記応答パケットの送信元アドレスを、前記特定したアドレスに変更する処理と、を前記コンピュータに実行させる、形態１５ないし１９のいずれか一に記載のプログラム。
［形態２１］
　受信した応答パケットの宛先ポート番号に対応付けられたアドレスを特定すると、前記保持する対応付けを削除する処理を前記コンピュータに実行させる、形態２０に記載のプログラム。 In the present invention, the following modes are further possible.
[Form 1]
As in the communication terminal according to the first aspect.
[Form 2]
The control unit refers to the setting storage unit to identify the data exchanging unit to which the identifier included in the packet is attached, and information indicating the identified data exchanging unit and the destination device included in the packet The communication terminal according to mode 1, wherein a communication interface to be used is determined from the plurality of communication interfaces by collating with a predetermined policy.
[Form 3]
The communication terminal according to the first or second aspect, wherein the predetermined policy includes correspondence between the data transmission / reception unit, information indicating the destination device, and a communication interface to be used.
[Form 4]
The setting storage unit associates and holds each communication interface and the address of the corresponding name resolution server,
The communication terminal according to any one of aspects 1 to 3, wherein the control unit specifies an address of a name resolution server corresponding to the determined communication interface based on the setting storage unit.
[Form 5]
The communication terminal according to any one of aspects 1 to 4, wherein the control unit receives the predetermined policy from a policy server.
[Form 6]
The control unit holds the transmission source port number of the packet and the identifier of the data transfer unit in association with each other, and when receiving a response packet for the packet, based on the association, the destination port of the received response packet Identify the address associated with the number,
The communication terminal according to any one of modes 1 to 5, wherein the communication processing unit changes a transmission source address of the response packet to an address specified by the control unit and outputs the changed address to the communication software basic unit.
[Form 7]
The communication terminal according to mode 6, wherein the control unit deletes the held association when the address associated with the destination port number of the received response packet is specified.
[Form 8]
The communication method according to the second aspect is as described above.
[Form 9]
The communication terminal refers to the setting storage unit, and specifies the data transfer unit attached with the identifier included in the packet;
And a step of collating information indicating the specified data exchange unit and the destination device included in the packet with the predetermined policy and determining a communication interface to be used from the plurality of communication interfaces. The communication method according to 8.
[Mode 10]
The communication method according to mode 8 or 9, wherein the predetermined policy includes an association between the data transmission / reception unit, information indicating the destination device, and a communication interface to be used.
[Form 11]
The communication terminal associates each communication interface with the address of the corresponding name resolution server and holds it in the setting storage unit;
The communication method according to any one of modes 8 to 10, further comprising: specifying an address of a name resolution server corresponding to the determined communication interface based on the setting storage unit.
[Form 12]
The communication method according to any one of aspects 8 to 11, including a step in which the communication terminal receives the predetermined policy from a policy server.
[Form 13]
The communication terminal holds the transmission source port number of the packet and the identifier of the data transfer unit in association with each other;
When receiving a response packet to the packet, the step of identifying an address associated with the destination port number of the received response packet based on the association held;
The communication method according to any one of aspects 8 to 12, further comprising: changing a transmission source address of the response packet to the specified address.
[Form 14]
The communication method according to mode 13, comprising a step of deleting the held association when the communication terminal specifies an address associated with the destination port number of the received response packet.
[Form 15]
The program according to the third aspect is as described above.
[Form 16]
A process of identifying a data transfer unit attached with an identifier included in the packet with reference to the setting storage unit;
A process of collating information indicating the specified data transfer unit and the destination device included in the packet with the predetermined policy and determining a communication interface to be used from the plurality of communication interfaces; The program according to the form 15, which is executed.
[Form 17]
The program according to form 15 or 16, wherein the predetermined policy includes an association between the data transmission / reception unit, information indicating the destination device, and a communication interface to be used.
[Form 18]
A process of associating each communication interface with the corresponding address of the name resolution server and holding in the setting storage unit;
The program according to any one of forms 15 to 17, which causes the computer to execute processing for specifying an address of a name resolution server corresponding to the determined communication interface based on the setting storage unit.
[Form 19]
The program according to any one of forms 15 to 18, which causes the computer to execute processing for receiving the predetermined policy from a policy server.
[Mode 20]
A process of associating and holding the transmission source port number of the packet and the identifier of the data transfer unit;
When a response packet for the packet is received, a process for identifying an address associated with a destination port number of the received response packet based on the association held.
The program according to any one of forms 15 to 19, which causes the computer to execute a process of changing a transmission source address of the response packet to the specified address.
[Form 21]
The program according to mode 20, wherein when the address associated with the destination port number of the received response packet is specified, the computer executes the process of deleting the retained association.
　なお、上記特許文献および非特許文献の全開示内容は、本書に引用をもって繰り込み記載されているものとする。本発明の全開示（請求の範囲を含む）の枠内において、さらにその基本的技術思想に基づいて、実施形態の変更・調整が可能である。また、本発明の請求の範囲の枠内において種々の開示要素（各請求項の各要素、各実施形態の各要素、各図面の各要素等を含む）の多様な組み合わせ、ないし、選択が可能である。すなわち、本発明は、請求の範囲を含む全開示、技術的思想にしたがって当業者であればなし得るであろう各種変形、修正を含むことは勿論である。特に、本書に記載した数値範囲については、当該範囲内に含まれる任意の数値ないし小範囲が、別段の記載のない場合でも具体的に記載されているものと解釈されるべきである。 It should be noted that the entire disclosure contents of the above patent documents and non-patent documents are incorporated by reference in this document. Within the scope of the entire disclosure (including claims) of the present invention, the embodiment can be changed and adjusted based on the basic technical concept. Further, various combinations or selections of various disclosed elements (including each element of each claim, each element of each embodiment, each element of each drawing, etc.) are possible within the scope of the claims of the present invention. It is. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea. In particular, with respect to the numerical ranges described in this document, any numerical value or small range included in the range should be construed as being specifically described even if there is no specific description.
１　　通信端末
２、２ａ、２ｂ　　無線ネットワーク
３　　有線ネットワーク
４、４ａ、４ｂ　　サーバ
５、５ａ、５ｂ　　名前解決サーバ
６　　ポリシサーバ
１１、１１ａ、１１ｂ　　通信インタフェース
１２、１２ａ、１２ｂ　　データ授受部
１３　　通信ソフトウェア基本部
１４　　制御部
１５　　通信処理部
１６　　設定記憶部
１７　　名前解決部 DESCRIPTION OF SYMBOLS 1 Communication terminal 2, 2a, 2b Wireless network 3 Wired network 4, 4a, 4b Server 5, 5a, 5b Name resolution server 6 Policy server 11, 11a, 11b Communication interface 12, 12a, 12b Data transfer part 13 Communication software basic part 14 control unit 15 communication processing unit 16 setting storage unit 17 name resolution unit

Claims (10)

  1. 　複数の通信インタフェースと、
    　宛先装置との間でデータを送受信するデータ授受部と、
    　前記データ授受部の識別子と前記データ授受部とを関連付けて保持する設定記憶部と、
    　前記設定記憶部を参照して前記データ授受部の識別子を取得する名前解決部と、
    　前記宛先装置を示す情報を含むと共に前記名前解決部が取得した識別子を含むパケットを生成する通信ソフトウェア基本部と、
    　前記パケットに含まれる前記宛先装置を示す情報および前記データ授受部の識別子と所定のポリシとを用いて、前記複数の通信インタフェースの中から使用すべき通信インタフェースを決定し、決定した通信インタフェースに対応する名前解決サーバのアドレスを特定する制御部と、
    　前記パケットの宛先アドレスを前記制御部が特定した名前解決サーバのアドレスに変更すると共に前記制御部が決定した通信インタフェースを介して前記パケットを送出する通信処理部と、を備える、通信端末。     Multiple communication interfaces;
    A data transfer unit that transmits and receives data to and from the destination device;
    A setting storage unit that holds the identifier of the data transfer unit and the data transfer unit in association with each other;
    A name resolution unit that obtains an identifier of the data transfer unit with reference to the setting storage unit;
    A communication software basic unit for generating a packet including information indicating the destination device and including an identifier acquired by the name resolution unit;
    A communication interface to be used is determined from among the plurality of communication interfaces using information indicating the destination device included in the packet, an identifier of the data transfer unit, and a predetermined policy, and corresponds to the determined communication interface A control unit for identifying the address of the name resolution server to be
    A communication terminal comprising: a communication processing unit that changes a destination address of the packet to an address of a name resolution server specified by the control unit and transmits the packet via a communication interface determined by the control unit.
  2. 　前記制御部は、前記設定記憶部を参照して前記パケットに含まれる識別子を付されたデータ授受部を特定すると共に、特定したデータ授受部と前記パケットに含まれる前記宛先装置を示す情報を前記所定のポリシに照合して前記複数の通信インタフェースの中から使用すべき通信インタフェースを決定する、請求項１に記載の通信端末。 The control unit refers to the setting storage unit to identify the data exchange unit to which the identifier included in the packet is attached, and also includes information indicating the identified data exchange unit and the destination device included in the packet. The communication terminal according to claim 1, wherein a communication interface to be used is determined from the plurality of communication interfaces by collating with a predetermined policy.
  3. 　前記所定のポリシは、前記データ授受部と前記宛先装置を示す情報と使用すべき通信インタフェースとの対応付けを含む、請求項１または２に記載の通信端末。 3. The communication terminal according to claim 1, wherein the predetermined policy includes a correspondence between the data transmission / reception unit, information indicating the destination device, and a communication interface to be used.
  4. 　前記設定記憶部は、各通信インタフェースと対応する名前解決サーバのアドレスとを関連付けて保持し、
    　前記制御部は、決定した通信インタフェースに対応する名前解決サーバのアドレスを前記設定記憶部に基づいて特定する、請求項１ないし３のいずれか１項に記載の通信端末。     The setting storage unit associates and holds each communication interface and the address of the corresponding name resolution server,
    The communication terminal according to claim 1, wherein the control unit specifies an address of a name resolution server corresponding to the determined communication interface based on the setting storage unit.
  5. 　前記制御部は、前記所定のポリシをポリシサーバから受け付ける、請求項１ないし４のいずれか１項に記載の通信端末。 The communication terminal according to any one of claims 1 to 4, wherein the control unit receives the predetermined policy from a policy server.
  6. 　前記制御部は、前記パケットの送信元ポート番号と前記データ授受部の識別子とを対応付けて保持し、前記パケットに対する応答パケットを受信すると、当該対応付けに基づいて、受信した応答パケットの宛先ポート番号に対応付けられたアドレスを特定し、
    　前記通信処理部は、前記応答パケットの送信元アドレスを、前記制御部が特定したアドレスに変更して、前記通信ソフトウェア基本部に出力する、請求項１ないし５のいずれか１項に記載の通信端末。     The control unit holds the transmission source port number of the packet and the identifier of the data transfer unit in association with each other, and when receiving a response packet for the packet, based on the association, the destination port of the received response packet Identify the address associated with the number,
    The communication according to any one of claims 1 to 5, wherein the communication processing unit changes a transmission source address of the response packet to an address specified by the control unit, and outputs the changed address to the communication software basic unit. Terminal.
  7. 　前記制御部は、受信した応答パケットの宛先ポート番号に対応付けられたアドレスを特定すると、前記保持する対応付けを削除する、請求項６に記載の通信端末。 The communication terminal according to claim 6, wherein when the control unit specifies an address associated with a destination port number of the received response packet, the control unit deletes the held association.
  8. 　複数の通信インタフェースと、宛先装置との間でデータを送受信するデータ授受部とを備えた通信端末が、
    　前記データ授受部の識別子と前記データ授受部とを関連付けて設定記憶部に保持する工程と、
    　前記設定記憶部を参照して前記データ授受部の識別子を取得する工程と、
    　前記宛先装置を示す情報を含むと共に前記取得した識別子を含むパケットを生成する工程と、
    　所定のポリシと前記パケットに含まれる前記宛先装置を示す情報および前記データ授受部の識別子を用いて、前記複数の通信インタフェースの中から使用すべき通信インタフェースを決定する工程と、
    　決定した通信インタフェースに対応する名前解決サーバのアドレスを特定する工程と、
    　前記パケットの宛先アドレスを前記特定した名前解決サーバのアドレスに変更すると共に、前記決定した通信インタフェースを介して前記パケットを送出する工程と、を含む、通信方法。     A communication terminal including a plurality of communication interfaces and a data transfer unit that transmits and receives data to and from a destination device.
    A step of associating the identifier of the data exchange unit and the data exchange unit and holding them in a setting storage unit;
    Obtaining an identifier of the data transfer unit with reference to the setting storage unit;
    Generating a packet including information indicating the destination device and including the acquired identifier;
    Determining a communication interface to be used from among the plurality of communication interfaces using a predetermined policy and information indicating the destination device included in the packet and an identifier of the data transfer unit;
    Identifying the address of the name resolution server corresponding to the determined communication interface;
    Changing the destination address of the packet to the address of the identified name resolution server, and sending the packet through the determined communication interface.
  9. 　前記通信端末が、前記設定記憶部を参照して前記パケットに含まれる識別子を付されたデータ授受部を特定する工程と、
    　特定したデータ授受部と前記パケットに含まれる前記宛先装置を示す情報を前記所定のポリシに照合して、前記複数の通信インタフェースの中から使用すべき通信インタフェースを決定する工程と、を含む、請求項８に記載の通信方法。     The communication terminal refers to the setting storage unit, and specifies the data transfer unit attached with the identifier included in the packet;
    Checking the specified data exchange unit and information indicating the destination device included in the packet with the predetermined policy, and determining a communication interface to be used from the plurality of communication interfaces. Item 9. The communication method according to Item 8.
  10. 　複数の通信インタフェースと、宛先装置との間でデータを送受信するデータ授受部とを備えた通信端末に設けられたコンピュータに対して、
    　前記データ授受部の識別子と前記データ授受部とを関連付けて設定記憶部に保持する処理と、
    　前記設定記憶部を参照して前記データ授受部の識別子を取得する処理と、
    　前記宛先装置を示す情報を含むと共に前記取得した識別子を含むパケットを生成する処理と、
    　所定のポリシと前記パケットに含まれる前記宛先装置を示す情報および前記データ授受部の識別子を用いて、前記複数の通信インタフェースの中から使用すべき通信インタフェースを決定する処理と、
    　決定した通信インタフェースに対応する名前解決サーバのアドレスを特定する処理と、
    　前記パケットの宛先アドレスを前記特定した名前解決サーバのアドレスに変更すると共に、前記決定した通信インタフェースを介して前記パケットを送出する処理と、を実行させる、プログラム。     For a computer provided in a communication terminal including a plurality of communication interfaces and a data transfer unit that transmits and receives data to and from a destination device,
    A process of associating the identifier of the data transmission / reception unit and the data transmission / reception unit and holding them in a setting storage unit;
    Processing for obtaining an identifier of the data transfer unit with reference to the setting storage unit;
    Generating a packet including information indicating the destination device and including the acquired identifier;
    A process of determining a communication interface to be used from among the plurality of communication interfaces using a predetermined policy and information indicating the destination device included in the packet and an identifier of the data transfer unit;
    Processing for identifying the address of the name resolution server corresponding to the determined communication interface;
    A program for changing the destination address of the packet to the address of the identified name resolution server and sending out the packet via the determined communication interface.
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