CN101883158B - Method and client for acquiring VLAN (Virtual Local Area Network) IDs (Identifiers) and network protocol addresses - Google Patents
Method and client for acquiring VLAN (Virtual Local Area Network) IDs (Identifiers) and network protocol addresses Download PDFInfo
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Abstract
The invention discloses method and client for acquiring VLAN (Virtual Local Area Network) IDs (Identifiers) and network protocol addresses. The method comprises the following steps of: determining that a message sent by a client needs to carry a VLAN ID by the client in the VLAN; sending a plurality of dynamic host configuration protocol (DHCP) DISCOVER messages carrying the VLAN ID to a DHCP server in the VLAN by the client, wherein each DHCP DISCOVER message corresponds to a VLAN ID; and within a first preset time, if the client receives DHCP response messages corresponding to the DHCP DISCOVER messages from the server, acquiring the VLAN IDs and IP addresses. Through the invention, the network configuration efficiency and accuracy are improved.
Description
Technical field
The present invention relates to the communications field, specifically, relate to a kind of method and the client that obtain VLAN (Virtual Local Area Network, referred to as VLAN) mark and procotol (Internet Protocol, referred to as IP) address.
Background technology
VLAN is a kind of technology physical network being divided into multiple logical local network (Local Area Network, referred to as LAN), and each VLAN has a virtual local area network identifiers (VLAN ID).Utilize vlan technology, network manager can according to practical application needs, user logic in Same Physical local area network (LAN) is divided into different broadcast domains (each broadcast domain i.e. a VLAN), make the user with same requirements be in same broadcast domain, the user of different demand is in different broadcast domains.Each VLAN logically just as an independently local area network (LAN), has identical attribute with the LAN physically formed.All broadcast in same VLAN and unicast traffic are all limited in, in this VLAN, can not being forwarded in other VLAN.
Dynamic host allocation protocol (Dynamic Host Configuration Protocol, referred to as DHCP).Its executive agent is divided into two: one to be server end, and another is client.All IP network set datas are all managed concentratedly by Dynamic Host Configuration Protocol server, and are responsible for the DHCP requirement of process client; Client then uses the IP information of getting off from server-assignment.Whole IP assigning process realizes automatically, on the client without the need to doing the setting of any IP world; All IP network set datas, all by Dynamic Host Configuration Protocol server unified management, can also help the parameters such as client specified network mask (netmask), name server (Domain Name Server, referred to as DNS), default gateway.
In correlation technique, if the message that Internet Transmission requirement dhcp client equipment sends carries the message of VLAN ID, dhcp client needs sending the VLAN ID configuring oneself before message, and this process is more loaded down with trivial details and easily make mistakes, thus causes DHCP to consult unsuccessfully.
Summary of the invention
Main purpose of the present invention is to provide a kind of method and the client that obtain VLAN ID and IP address, to solve in correlation technique, if the message that Internet Transmission requirement dhcp client equipment sends carries the message of VLAN ID, dhcp client needs the VLAN ID configuring oneself before sending message, this process is more loaded down with trivial details and easily make mistakes, thus causes DHCP to consult failed problem.
To achieve these goals, according to an aspect of the present invention, a kind of method obtaining VLAN ID VLAN ID and procotol IP address is provided.
Method according to acquisition VLAN ID VLAN ID of the present invention and procotol IP address comprises:
The message that in virtual LAN VLAN, client determination client sends needs to carry VLAN ID VLAN ID; Client sends multiple dynamic host allocation protocol carrying VLAN ID to the dynamic host allocation protocol Dynamic Host Configuration Protocol server in VLAN and finds DHCP DISCOVER message, wherein the corresponding VLAN ID of each DHCP DISCOVER message; Within first scheduled time, if client receives from dhcp response message corresponding to the DHCP DISCOVER message of server, then according to dhcp response Receive message VLAN ID and IP address.
Further, the message that in VLAN, client determination client sends needs to carry VLAN ID and comprises: client sends DHCP message, and wherein VLAN ID is carried in DHCP message cancellation; Within second scheduled time, if client does not receive dhcp response message corresponding to DHCP message, then determine that the message that client sends needs to carry VLANID.
Further, the DHCPDISCOVER message that client sends the multiple VLAN of carrying ID comprises: client carries predetermined DHCP option in DHCP DISCOVER message, wherein, DHCP option is the value for identifying server corresponding to client of Operation system setting.
Further, client comprises according to dhcp response Receive message VLAN ID and IP address: client judges whether dhcp response message carries DHCP option; If judged result is yes, then determines that dhcp response message carrys out self-corresponding server, and from dhcp response message, obtain VLAN ID and IP address.
Further, the maximum quantity that DHCP DISCOVER message sends is 4094.
To achieve these goals, according to another aspect of the present invention, a kind of client is provided.
Client according to the present invention comprises: determination module, for determining that the message that client sends needs to carry VLAN ID VLAN ID; Sending module, finds DHCP DISCOVER message for sending multiple dynamic host allocation protocol carrying VLAN ID to the dynamic host allocation protocol Dynamic Host Configuration Protocol server in VLAN, the wherein corresponding VLAN ID of each DHCPDISCOVER message; Acquisition module, within first scheduled time, when client receives dhcp response message corresponding to DHCP DISCOVER message from server, according to dhcp response Receive message VLAN ID and IP address.
Further, determination module comprises: send submodule, and for sending DHCP message, wherein VLAN ID is carried in DHCP message cancellation; VLAN ID determines submodule, within second scheduled time, when client does not receive dhcp response message corresponding to DHCP message, determines that the message that client sends needs to carry VLAN ID.
Further, sending module comprises: carry submodule, and for carrying predetermined DHCP option in DHCPDISCOVER message, wherein, DHCP option is the value for identifying server corresponding to client of Operation system setting.
Further, acquisition module comprises: judge submodule, for judging whether dhcp response message carries DHCP option; Message determination submodule, for when judged result is for being, determines that dhcp response message carrys out self-corresponding server; Obtain submodule, for obtaining VLAN ID and IP address from dhcp response message.
Further, the maximum quantity forwarded of the DHCP DISCOVER message of the first sending module transmission is 4094.
By the present invention, the message that in virtual LAN VLAN, client determination client sends is adopted to need to carry VLAN ID VLAN ID; Client sends multiple dynamic host allocation protocol DHCPDISCOVER message carrying VLAN ID to the server in VLAN, wherein the corresponding VLANID of each DHCP DISCOVER message; Within first scheduled time, if client receives from dhcp response message corresponding to the DHCPDISCOVER message of server, then according to dhcp response Receive message VLAN ID and IP address, solve in correlation technique, if the message that Internet Transmission requirement dhcp client equipment sends carries the message of VLAN ID, dhcp client needs before sending message, configure oneself VLAN ID and IP address, this process is more loaded down with trivial details and easily make mistakes, thus cause DHCP to consult failed problem, and then reach the effect improving network configuration efficiency and accuracy rate.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the vlan network topological diagram according to correlation technique;
Fig. 2 is the flow chart according to the acquisition VLAN ID of the embodiment of the present invention and the method for IP address;
Fig. 3 is the flow chart of the method obtaining VLAN ID and IP address according to the preferred embodiment of the invention;
Fig. 4 is the structured flowchart of the client according to the embodiment of the present invention; And
Fig. 5 is the preferred structured flowchart of the client according to the embodiment of the present invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
All be based on the application in vlan network in following embodiment of the present invention, Fig. 1 is the vlan network topological diagram according to correlation technique, and as shown in Figure 1, client is linked in network by switch, communicates with Dynamic Host Configuration Protocol server.
Embodiment one
In the present embodiment, a kind of method obtaining VLAN ID and IP address is provided.Fig. 2 is the flow chart according to the acquisition VLAN ID of the embodiment of the present invention and the method for IP address, as shown in Figure 2, comprising:
In step S202, VLAN, client determines that the message that this client sends needs to carry VLAN ID VLAN ID.
Step S204, client sends multiple dynamic host allocation protocol carrying VLAN ID to the Dynamic Host Configuration Protocol server in VLAN and finds DHCP DISCOVER message, wherein the corresponding VLAN ID of each DHCP DISCOVER message.
Step S206, within first scheduled time, if client receives from dhcp response message corresponding to the DHCP DISCOVER message of server, then according to dhcp response Receive message VLAN ID and IP address.
Pass through above-mentioned steps, according to dhcp response Receive message VLAN ID and IP address, if avoid the message that message that in correlation technique, Internet Transmission requirement dhcp client equipment sends carries VLAN ID, dhcp client needs the VLAN ID configuring oneself before sending message, this process is more loaded down with trivial details and easily make mistakes, thus cause DHCP to consult failed problem, achieve dhcp client automatic acquisition VLAN ID and IP address, improve efficiency and the accuracy of network configuration.
The message sent client determination client in VLAN in step S202 below needs one that carries VLAN ID and is preferred embodiment described.In this preferred implementation, first client sends DHCP message, and wherein VLAN ID is carried in DHCP message cancellation; Then within second scheduled time, if client does not receive dhcp response message corresponding to DHCP message, then determine that the message that client sends needs to carry VLAN ID.By the determining step of the preferred embodiment, within second scheduled time, can not receiving according to client the message that dhcp response message determination client corresponding to DHCP message send to need to carry VLAN ID, whether carrying the judgement of VLAN ID VLAN ID by this embodiment achieves the message sent client.
Such as: the DHCP DISCOVER message sending multiple band VLAN label to network continuously, the VLAN ID of each DISCOVER message is all different.If have received the dhcp response message of band VLAN label and message content is correct in process of transmitting, option verification is correct, then stop immediately sending message, and obtain VLANID and IP address by response message, use the VLAN ID and IP address that obtain at follow-up transmission message.In this way, if the speed receiving response message is comparatively slow, the maximum quantity so sending DHCP message is 4094 (the corresponding DHCP message of VLAN ID).
One that client in step S204 is sent to the DHCPDISCOVER message of the multiple VLAN of carrying ID below is preferred embodiment described.In this preferred implementation, client carries predetermined DHCP option in DHCP DISCOVER message, and wherein, DHCP option is the value for identifying server corresponding to client of Operation system setting.Carry step by the preferred embodiment, the value for identifying server corresponding to client can be carried in DHCP DISCOVER message, the dhcp response message receiving interference can be avoided, achieve the mark of the client pair server corresponding with it.
Below according to dhcp response Receive message VLAN ID and IP address one of client in step S206 is preferred embodiment described.In this preferred implementation, first client judges whether dhcp response message carries DHCP option; If judged result is yes, then determines that dhcp response message carrys out self-corresponding server, and from dhcp response message, obtain VLAN ID and IP address.By the determining step of the preferred embodiment, judge that this dhcp response message is the correct message from corresponding server, thus VLAN ID and IP address can be obtained from this dhcp response message, achieve the discriminating of the response message to different server.
Such as: in systems in practice, config option 60 on the dhcp server, the value of option 60 is a special ident value.When DHCP CLIENT equipment structure message, add in request list and differentiate option 60, and after DHCP SERVER receives the request of equipment, in response message, fill the mark that this is special.When DHCP CLIENT equipment receives dhcp response, extract the value of option 60, and compare with particular value, if identical, then think the dhcp response message expected, think and have received correct response, from this message, extract VLAN ID and IP address; Otherwise, think that this response message is incorrect, abandon this response message.
Preferably, the maximum quantity that DHCP DISCOVER message sends is 4094, and the preferred embodiment defines the maximum quantity of the transmission of DHCP DISCOVER message.
Embodiment two
In the present embodiment, the acquisition of client to VLAN ID and IP address is achieved.
Fig. 3 is the flow chart of the method obtaining VLAN ID and IP address according to the preferred embodiment of the invention, as shown in Figure 3, comprising:
Step S302, is constructed a DHCP DISCOVER message not with VLAN label, carries option 60, sent by message by network interface in options request list.
Step S304, arranges a timer and enters wait state; If have received DHCP OFFER message in the 60s waited for, and DHCP OFFER message have passed the verification of option 60, then equipment structure DHCP REQUEST is divided into groups and is sent by network interface, if have received DHCP ACK message, and message content is correct, then equipment completes correct DHCP message reciprocal process, and the IP address obtained is effective, enters into step S306; If judged result is no, namely not receiving correct DHCP ACK message in 60s, then enter into step S310.
Step S306, the VLAN ID arranging network is invalid, and when after this sending message by network interface, the message sent all is not with VLAN ID.
Step S308, extracts IP address, and uses this address to carry out packet sending and receiving from dhcp response message (DHCP OFFER message and DHCPACK message).
Step S310, constructs 100 DHCP DISCOVER messages a second, carries option 60 in request list, each message carries VLAN label, the VLAN ID that each message carries sequentially increases, and different, is sent continuously by network interface 100 messages.
Step S312, checks whether the DHCPOFFER response receiving and be with the option 60 of VLAN correct; If do not receive correct response, then forward step S314 to; If receive correct response, then forward step S316 to.
Step S314, judges whether to send 4094 messages, if be not sent, then forward step S310 to and continues to send message; If be sent, then no longer send.
Step S316, if have received the DHCP OFFER message of band VLAN, equipment structure DHCP REQUEST message, and fill the VLAN label identical with OFFER message at ethernet layer, by network interface, DHCP REQUEST is sent, after have received DHCP ACK message, and message content is correct, then equipment completes correct DHCP message reciprocal process, and the IP address obtained is effective, enters into step S318.
Step S318, the VLAN ID arranging network is the VLAN ID of DHCP OFFER message, and when after this sending message by network interface, the message sent all carries VLAN label, and VLAN ID is identical with the VLAN ID of DHCP OFFER message.
Step S320, extracts IP address, and uses this address to carry out packet sending and receiving from dhcp response message (DHCP OFFER message and DHCPACK message).
In an embodiment, client can recognition network scene, achieves and obtains IP address by normal DHCP message not being with in VLANID scene, in the scene of band VLAN ID, obtain VLAN ID and IP address by the DHCP message sending multiple VLAN.
Embodiment three
The present embodiment combines embodiment one and preferred implementation wherein, provides a kind of client in the present embodiment.Fig. 4 is the structured flowchart of the client according to the embodiment of the present invention, and as shown in Figure 4, this client comprises:
Determination module 42, for determining that the message that client sends needs to carry VLAN ID VLAN ID; Sending module 44, be connected to determination module 42, when determination module 42 determines that the message that client sends needs to carry VLAN ID VLAN ID, for sending multiple dynamic host allocation protocol DHCP DISCOVER message carrying VLAN ID to the Dynamic Host Configuration Protocol server in VLAN, the wherein corresponding VLAN ID of each DHCP DISCOVER message; Acquisition module 46, be connected to sending module 44, for within first scheduled time, when client receives dhcp response message corresponding to DHCP DISCOVER message that the sending module 44 from server sends, according to dhcp response Receive message VLAN ID and IP address.
Fig. 5 is the preferred structured flowchart of the client according to the embodiment of the present invention, as shown in Figure 5, determination module 42 comprises transmission submodule 422 and VLAN ID determines submodule 424, sending module 44 comprises: carry submodule 442, acquisition module 44 comprises: judge submodule 462, message determination submodule 464 and obtain submodule 466, being described in detail below to said structure:
Determination module 42 comprises: send submodule 422, and for sending DHCP message, wherein VLAN ID is carried in DHCP message cancellation; VLAN ID determines submodule 424, be connected to and send submodule 422, for within second scheduled time, client do not receive send dhcp response message corresponding to DHCP message that submodule 422 sends time, determine that the message that client sends needs to carry VLAN ID.
Sending module 44 comprises: carry submodule 442, is connected to VLAN ID and determines submodule 424, and for carrying predetermined DHCP option in DHCP DISCOVER message, wherein, DHCP option is the value for identifying server corresponding to client of Operation system setting.
Acquisition module 46 comprises:
Judge submodule 462, for judging whether dhcp response message carries DHCP option; Message determination submodule 464, is connected to and judges submodule 462, for when judging submodule 462 judged result as being, determines that dhcp response message carrys out self-corresponding server; Obtaining submodule 466, be connected to message determination submodule 464, during for determining that at message determination submodule 464 dhcp response message carrys out self-corresponding server, from dhcp response message, obtaining VLAN ID and IP address.
Preferably, the maximum quantity forwarded of the DHCP DISCOVER message of the first sending module transmission is 4094.
By the above embodiments of the present invention, dhcp client equipment can adapt to different network scenarios and obtain IP address.In not with the scene of VLAN, obtain IP address by normal DHCP message, in the network environment of band VLAN, obtain IP address by the DHCP message sending multiple VLANID, improve efficiency and the accuracy rate of network configuration.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. obtain a method for VLAN ID VLAN ID and procotol IP address, it is characterized in that, comprising:
In virtual LAN VLAN, client determines that the message that described client sends needs to carry VLAN ID VLAN ID;
Described client sends multiple dynamic host allocation protocol carrying VLAN ID to the dynamic host allocation protocol Dynamic Host Configuration Protocol server in described VLAN and finds DHCP DISCOVER message, wherein the corresponding VLAN ID of each described DHCP DISCOVER message;
Within first scheduled time, if described client receives from dhcp response message corresponding to the described DHCP DISCOVER message of described server, then VLAN ID and described IP address according to described dhcp response Receive message.
2. method according to claim 1, is characterized in that, in VLAN, client determines that message that described client sends needs to carry VLAN ID and comprises:
Described client sends DHCP message, and described VLAN ID is carried in wherein said DHCP message cancellation;
Within second scheduled time, if described client does not receive dhcp response message corresponding to described DHCP message, then determine that the message that described client sends needs to carry described VLAN ID.
3. method according to claim 1, is characterized in that, the DHCP DISCOVER message that described client sends the multiple VLAN of carrying ID comprises:
Described client carries predetermined DHCP option in described DHCP DISCOVER message, and wherein, described DHCP option is the value for identifying server corresponding to described client of Operation system setting.
4. method according to claim 3, is characterized in that, described client VLAN ID and described IP address according to described dhcp response Receive message comprise:
Described client judges whether described dhcp response message carries described DHCP option;
If judged result is yes, then determines that described dhcp response message carrys out self-corresponding described server, and from described dhcp response message, obtain described VLAN ID and described IP address.
5. the method according to any one of Claims 1-4, is characterized in that, the maximum quantity that described DHCP DISCOVER message sends is 4094.
6. a client, is characterized in that, comprising:
Determination module, for determining that the message that described client sends needs to carry VLAN ID VLAN ID;
Sending module, DHCP DISCOVER message is found, the wherein corresponding VLAN ID of each described DHCP DISCOVER message for sending multiple dynamic host allocation protocol carrying VLAN ID to the dynamic host allocation protocol Dynamic Host Configuration Protocol server in described VLAN;
Acquisition module, within first scheduled time, when described client receives dhcp response message corresponding to described DHCP DISCOVER message from described server, VLAN ID and IP address according to described dhcp response Receive message.
7. client according to claim 6, is characterized in that, described determination module comprises:
Send submodule, for sending DHCP message, described VLAN ID is carried in wherein said DHCP message cancellation;
VLAN ID determines submodule, within second scheduled time, when described client does not receive dhcp response message corresponding to described DHCP message, determines that the message that described client sends needs to carry described VLAN ID.
8. client according to claim 6, is characterized in that, described sending module comprises:
Carry submodule, for carrying predetermined DHCP option in described DHCP DISCOVER message, wherein, described DHCP option is the value for identifying server corresponding to described client of Operation system setting.
9. client according to claim 8, is characterized in that, described acquisition module comprises:
Judge submodule, for judging whether described dhcp response message carries described DHCP option;
Message determination submodule, for when judged result is for being, determines that described dhcp response message carrys out self-corresponding described server;
Obtain submodule, for obtaining described VLAN ID and described IP address from described dhcp response message.
10. the client according to any one of claim 6 to 9, is characterized in that, the maximum quantity forwarded of the DHCP DISCOVER message that described sending module sends is 4094.
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