WO2009124477A1 - Procédé, système et dispositif pour une transmission de paquets - Google Patents

Procédé, système et dispositif pour une transmission de paquets Download PDF

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Publication number
WO2009124477A1
WO2009124477A1 PCT/CN2009/070974 CN2009070974W WO2009124477A1 WO 2009124477 A1 WO2009124477 A1 WO 2009124477A1 CN 2009070974 W CN2009070974 W CN 2009070974W WO 2009124477 A1 WO2009124477 A1 WO 2009124477A1
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Prior art keywords
network
message
indication message
packet
network type
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PCT/CN2009/070974
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English (en)
Chinese (zh)
Inventor
杨庆
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华为技术有限公司
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Publication of WO2009124477A1 publication Critical patent/WO2009124477A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, system, and apparatus for message transmission. Background technique
  • IPv4 Internet Protocol Version 4, Internet Protocol Version 4
  • IPv6 Internet Protocol Version 6, Internet Protocol Version 6
  • IPv6 Internet Protocol Version 6, Internet Protocol Version 6
  • the intermediate node of the IPv6 packet transmission path prohibits fragmentation of IPv6 packets. That is, the IPv6 "3 ⁇ 4" sender can use the Path MTU (Path Maximum Transfer Unit) discovery mechanism to learn the minimum MTU of all nodes in the IPv6 network, that is, the PMTU (Path MTU).
  • the PMTU sends an IPv6 packet.
  • the IPv6 packet is sent to the dual-stack network device according to the PMTU in the IPv6 network, the IPv6 packet is first encapsulated into an IPv4 packet, and then the IPv4 packet is forwarded.
  • the DF (Do Don't Fragment) flag in the IPv4 header will be set to 1, which means that no node is allowed to fragment it.
  • IPv4 Internet Control Message Protocol Version 4
  • ICMPv4 Internet Control Message Protocol Version 4
  • IPv4 packet containing an IPv6 packet when transmitted over an IPv4 network, if the packet length is greater than the MTU of the sending port of the node, the node encapsulates the IPv4 packet with IPv4 packet according to the processing in the IPv4 network.
  • the source of the packet sends an ICMPv4 message with Packet Too Big (the message is too long), as shown in Figure 1.
  • the ICMPv4 message is encapsulated in an IPv4 packet.
  • the destination IP address Internet Protocol
  • the sender of the IPv6 packet is not aware of the reason why the packet failed to be sent.
  • the embodiment of the invention provides a method, a system and a device for transmitting a message, so as to send an ICMP message back to the source end of the IPv6 packet when the IPv6 packet fails to be transmitted on the IPv4 network, so that the IPv6 packet traverses the IPv4 packet.
  • the network reaches its destination.
  • an embodiment of the present invention provides a method for transmitting a packet, including the following steps: receiving an indication message of a first network, where the indication message of the first network carries a source address of a packet of a second network type Obtaining a source address of the second network type packet according to the indication message of the first network, and translating the indication message of the first network into an indication message of the second network; Network type message And sending, by the source address, the indication message of the second network to the source end of the second network type packet.
  • the embodiment of the present invention further provides a system for transmitting a message, including: a dual protocol stack device, configured to receive an indication message of the first network, where the indication message of the first network carries a packet of the second network type The source address and the destination address are obtained, and the source address of the second network type packet is obtained according to the indication message of the first network, and the indication message of the first network is translated into an indication message of the second network, and according to the And sending, by the source address of the second network type packet, an indication message of the second network.
  • a dual protocol stack device configured to receive an indication message of the first network, where the indication message of the first network carries a packet of the second network type The source address and the destination address are obtained, and the source address of the second network type packet is obtained according to the indication message of the first network, and the indication message of the first network is translated into an indication message of the second network, and according to the And sending, by the source address of the second network type packet, an indication message of the second network.
  • the embodiment of the present invention further provides a dual protocol stack device, including: a receiving module, configured to receive an indication message of the first network, where the indication message of the first network carries a source address of the second network type packet a destination address, a translation module, configured to acquire a source address of the second network type packet according to the indication message of the first network received by the receiving module, and translate the indication message of the first network into a second network And a sending module, configured to send, according to the source address of the second network type packet, an indication message of the second network translated by the translation module to the source end of the second network type packet.
  • a receiving module configured to receive an indication message of the first network, where the indication message of the first network carries a source address of the second network type packet a destination address
  • a translation module configured to acquire a source address of the second network type packet according to the indication message of the first network received by the receiving module, and translate the indication message of the first network into a second network
  • a sending module configured to send, according to the source address
  • the embodiment of the present invention further provides a source device of the second network type packet, including: a message receiving module, configured to receive an indication message of the second network sent by the dual protocol stack device; Adjusting the length of the second network type packet according to the length of the committed second network type packet in the indication message of the second network received by the message receiving module; the packet sending module, configured to use the second network type according to the second network type The source address of the packet is sent by the adjustment module to the second network type packet.
  • a message receiving module configured to receive an indication message of the second network sent by the dual protocol stack device
  • the packet sending module configured to use the second network type according to the second network type
  • the source address of the packet is sent by the adjustment module to the second network type packet.
  • the embodiment of the present invention further provides a first network node, including: a determining module, configured to determine whether a length of a second network type packet encapsulating a header of the first network type exceeds the first network node The length of the maximum transmission unit, the adding module, configured to: after the determining module determines that the length of the second network type packet exceeds the length of the maximum transmission unit of the first network node, the second network type The source address and the destination address of the packet are added to the indication message of the first network, and the message sending module is configured to send the indication message of the first network generated by the adding module to the dual protocol stack device, and discard the The second network type message.
  • a determining module configured to determine whether a length of a second network type packet encapsulating a header of the first network type exceeds the first network node The length of the maximum transmission unit
  • the adding module configured to: after the determining module determines that the length of the second network type packet exceeds the length of the maximum transmission unit of the first network node, the second
  • the embodiment of the present invention has the following advantages:
  • the dual protocol stack device receives the indication message of the first network according to the embodiment of the present invention, according to The indication message of the first network acquires the source address of the second network type packet, translates the indication message of the first network into the indication message of the second network, and sends the indication message of the second network to the second network type packet.
  • the source end so that the indication message of the second network is sent back to the source end of the second network type packet, and the source end of the second network type packet adjusts the length of the second network type packet according to the second network type message And resending the second network type packet, and finally implementing the second network type packet to traverse the first network to reach the destination.
  • FIG. 1 is a schematic diagram of a format of a packet Too Big message of ICMPv4 in the prior art
  • FIG. 2 is a flowchart of a method for transmitting a message according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a format of an ICMPv6 message according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a transmission process of an IPv6 packet traversing an IPv4 network according to Embodiment 1 of the present invention.
  • FIG. 6 is a structural diagram of a system for transmitting a message according to an embodiment of the present invention. detailed description
  • the embodiment of the present invention provides a method for transmitting a message.
  • the embodiment of the present invention provides an example in which the first network is given as an IPv4 network, the second network is given as an IPv6 network, and the indication message is an ICMP message. Therefore, in the embodiment of the present invention, the first network type packet is an IPv4 packet, the second network type packet is an IPv6 packet, the first network indication message is an ICMPv4 message, and the second network indication message is an ICMPv6 message.
  • a dual stack device is a device that supports both the IPv4 protocol and the IPv6 protocol.
  • the dual stack device receives The ICMPv4 message obtains the source address of the IPv6 packet according to the ICMPv4 message, translates the ICMPv4 message into an ICMPv6 message, and sends the ICMPv6 message to the source end of the IPv6 packet, thereby implementing the source of the ICMP message sent back to the IPv6 packet, IPv6.
  • the source end of the packet adjusts the length of the IPv6 packet according to the ICMPv6 message, and retransmits the IPv6 packet.
  • the IPv6 packet traverses the IPv4 network to reach the destination.
  • FIG. 2 it is a flowchart of a method for transmitting a message according to an embodiment of the present invention, which includes the following steps:
  • Step S201 Receive an ICMPv4 message, where the ICMPv4 message carries a source address and a destination address of the IPv6 packet.
  • the dual-stack device receives the ICMPv4 message sent by the node on the IPv4 transmission path of the IPv4 network.
  • the ICMPv4 message is a modified Packet Too Big message, and the Packet Too Big message carries the source address and the destination address of the IPv6 packet. If the protocol number in the protocol field of the IPv4 text in the ICMPv4 message is 0x29, the original data carried is directly increased from 8 bytes to 48 bytes. The 48 bytes contain a complete IPv6 message header and the first 8 bytes of the original IPv6 message.
  • Step S202 Acquire an IP address of the IPv6 packet according to the ICMPv4 message, and translate the ICMPv4 message into an ICMPv6 message.
  • the dual-stack device parses the ICMPv4 message to obtain the source address of the IPv6 file, and translates the ICMPv4 message into an ICMPv6 message.
  • a new message type corresponding to the ICMPv4 message is added to the ICMPv6 message, as shown in Figure 3.
  • the MTUv4 IPv4 Maximum Transfer Unit
  • the subtracted 20 is the IPv4 header length. Therefore, the size of the IPv6 packet sent by the IPv6 source cannot be larger than the Path MTU of the IPv6 network.
  • the dual protocol stack device can directly translate the ICMPv4 message to be sent into an ICMPv6 message and send it back.
  • the IPv6 source is no longer sending ICMPv4 messages.
  • Step S203 Send an ICMPv6 message to the source end of the IPv6 packet.
  • Dual protocol stack The device sends an ICMPv6 message to the source end of the IPv6 packet, and sends the ICMP message back to the source end of the IPv6 packet.
  • Step S204 The source end of the IPv6 packet adjusts the length of the IPv6 packet according to the length of the committed IPv6 packet in the ICMPv6 message, and sends the adjusted IPv6 packet.
  • the embodiment of the present invention uses the Committed IPv6 Packet Length as the MTUv4-20 as an example.
  • device A is configured to send an IPv6 packet to device F
  • device A is an IPv6 packet source
  • device F is an IPv6 packet.
  • other devices are intermediate devices, as shown in Figure 5.
  • Device A and device F are IPv6 devices
  • device C and device D are IPv4 devices
  • device B and device E are dual-stack devices that support both IPv4 and IPv6.
  • the IPv6 tunnel spanning the IPv4 network is built in these two pairs.
  • the device sends an IPv6 packet to the device A. which is:
  • PMTU min ⁇ MTUv6_l, MTUv6_2, MTUv6_3 ⁇
  • MTUv6_l and MTUv6_3 are IPv6 MTUs on the IPv6 interface, and MTUv6_2 is the IPv6 MTU in the tunnel.
  • MTUv4_l, MTUv4_2, and MTUv4_3 are the MTUs of the IPv4 outbound interfaces on the IPv4 network. Assumption:
  • Step S401 The device B receives the IPv6 packet sent by the device A, encapsulates the IPv6 packet into an IPv4 packet, and forwards the IPv4 packet to the intermediate device.
  • Device A sends an IPv6 packet to device B according to the PMTU of the IPv6 network. Since the PMTU is the minimum value of the MTU in the IPv6 network, the packet IPv6_Packet_l can be successfully sent from the device A to the tunnel interface of the device B.
  • the device B After receiving the IPv6 packet, the device B receives the IPv6 packet.
  • IPv4 encapsulate it into an IPv4 message.
  • device B encapsulates the IPv6 header into a 20-byte IPv4 header (DF flag is set to 1), the packet size is still smaller than MTUv4_l, and device B continues to forward IPv4 to device C. Message.
  • Step S402 Determine whether the length of the IPv4 packet exceeds the length of the MTU of the device. After receiving the IPv4 packet, the device C determines whether the length of the IPv6_Packet_1 packet encapsulating the IPv4 header exceeds the length of the MTU of the device (that is, the MTUv4_2 of the outbound interface of the device C). If not, the process proceeds to step S403. Otherwise, step S404 is performed. .
  • Step S403 forwarding the IPv4 packet to the next intermediate device.
  • Device C forwards the IPv4 packet to the next intermediate device (device D). After receiving the IPv4 packet, device D processes the same process as device C.
  • Step S404 generating an ICMPv4 message and sending it to device B.
  • the outbound interface of device C finds that the length of the IPv6_Packet_1 packet encapsulating the IPv4 header exceeds its own MTU (MTUv4_2), and the DF flag is set to 1, so that an ICMPv4 (Packet Too Big) message with protocol number 0x29 is sent to device B. , also discard IPv6_Packet_l.
  • Step S405 the device B parses the ICMPv4 message, translates it into an ICMPv6 message, and sends it to the device A. After the ICMPv4 message reaches device B, device B finds that the message belongs to the IPv6 network, parses it and translates the ICMPv4 message into an ICMPv6 message, and then sends it to device A.
  • step S406 the device A parses the ICMPv6 message, adjusts the length of the IPv6 packet, and sends the adjusted IPv6 packet to the device B again. After ICMPv6 reaches device A, it is parsed by device A. It is found that the packet length exceeds the MTUv4_2 of the outbound interface of device C in the IPv4 network. Then, IPv6_Packet_2 whose length does not exceed (MTUv4_2 - 20) is resent to device B. .
  • IPv6_Packet_2 reaches device D and the MTU (MTUv4_3) exceeds the outgoing interface of the device D
  • the device D sends an ICMPv4 message to device B and discards IPv6_Packet_2.
  • Device B parses and translates the ICMPv4 again.
  • the message is an ICMPv6 message and is sent to the device A.
  • the ICMPv6 with the MTUv4_3 message arrives at the device A, the same processing as the first ICMPv6 message is performed, and the IPv6_Packet_3 whose message length does not exceed (MTUv4_3 - 20) is resent. In this way, IPv6 can be successfully passed through device E to device F.
  • the dual protocol stack device receives the ICMPv4 message, obtains the source address of the IPv6 packet according to the ICMPv4 message, translates the ICMPv4 message into an ICMPv6 message, and sends the ICMPv6 message to the ICMPv6 message.
  • the source end of the IPv6 packet so that the source end of the IPv6 packet is sent back to the IPv6 packet.
  • the source end of the IPv6 packet adjusts the length of the IPv6 packet according to the ICMPv6 message, and retransmits the adjusted IPv6 packet. IPv6 packets traverse the IPv4 network to reach the destination.
  • the above embodiment only modifies the actual size of the transmitted message, and does not change the size of the PMTU in the IPv6 network, and therefore does not conflict with the specification of "the minimum MTU of the IPv6 network is not less than 1280 bytes".
  • a structural diagram of a system for transmitting a message includes: a dual protocol stack device 61, configured to receive an indication message of a first network, where the indication message of the first network carries a second network type The source address and the destination address of the packet are obtained according to the indication message of the first network, and the source network address of the second network type is translated into an indication message of the second network, and the second network is sent. Indicate the message.
  • the system for transmitting the message further includes: a source device 62 of the second network type packet, configured to receive the indication message of the second network sent by the dual protocol stack device 61, and according to the commitment in the indication message of the second network
  • the length of the second network type packet is adjusted, and the adjusted second network type packet is sent, and the length of the adjusted second network type packet is encapsulated by the header of the first network type. Does not exceed the length of the largest transmission unit.
  • the system for transmitting the message further includes: a first network node 63, configured to determine whether a length of the second network type packet encapsulating the header of the first network type exceeds a length of a maximum transmission unit of the first network node, if If yes, the source address and the destination address of the second network type packet are added to the indication message of the first network, and the indication message of the first network is sent to the dual protocol stack device, and the second network type packet is discarded.
  • the dual protocol stack device 61 includes: a receiving module 611, configured to receive an indication message of the first network, where the indication message of the first network carries a source address and a destination address of the second network type packet;
  • the translation module 612 is configured to obtain a source address of the second network type packet according to the indication message of the first network received by the receiving module 611, and translate the indication message of the first network into an indication message of the second network;
  • the sending module 613 is configured to send the indication message of the first network translated by the translation module 612 to the source device 62 of the second network type message.
  • the source device 62 of the second network type packet includes: a message receiving module 621, configured to receive an indication message of the second network sent by the dual protocol stack device 61;
  • the adjusting module 622 is configured to adjust the length of the second network type packet according to the committed second network type packet length in the indication message of the second network received by the message receiving module 621;
  • the message sending module 623 is configured to send the second network type packet adjusted by the adjusting module 622.
  • the first network node 63 includes: a determining module 631, configured to determine whether a length of the second network type packet encapsulating the header of the first network type exceeds a length of the maximum transmission unit of the first network node 63;
  • the adding module 632 is configured to add the source address and the destination address of the second network type to the second network type after the determining module 631 determines that the length of the second network type packet exceeds the length of the maximum transmission unit of the first network node 63.
  • the indication message of a network
  • the message sending module 633 is configured to send the indication message of the first network generated by the adding module 632 to the dual protocol stack device 61, and discard the second network type message.
  • the source device 62 of the second network type packet may be a source device of the IPv6 packet, and the first network node 63 may be an IPv4 node, and the dual protocol stack device is a device that supports both the IPv4 protocol and the IPv6 protocol.
  • the dual protocol stack device 61 receives the indication message of the first network, and obtains the second network type packet according to the indication message of the first network.
  • the source address, the indication message of the first network is translated into the indication message of the second network, and the indication message of the second network is sent to the source device 62 of the second network type message, thereby implementing the indication of the second network.
  • the message is sent back to the source end of the second network type packet, and the source end device 62 of the second network type packet is sent according to the second
  • the network type message adjusts the length of the second network type packet, retransmits the second network type packet, and finally implements the second network type packet to traverse the first network to reach the destination.
  • the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for making a A computer device (which may be a personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention porte sur un procédé, un système et un dispositif pour une transmission de paquets. Le procédé pour une transmission de paquets comprend : la réception du message d'indication du premier réseau, le message d'indication du premier réseau portant l'adresse source et l'adresse de destination du paquet du second type de réseau ; l'obtention de l'adresse source du paquet du second type de réseau conformément au message d'indication du premier réseau, et la traduction du message d'indication du premier réseau en message d'indication du second réseau ; l'envoi du message d'indication du second réseau à l'extrémité de source du paquet du second type de réseau conformément à l'adresse source du paquet du second type de réseau. L'invention permet d'obtenir que le message ICMP est renvoyé à l'extrémité de source du paquet IPv6, et l'extrémité de source du paquet IPv6 ajuste la longueur du paquet IPv6 conformément au message ICMPv6 et renvoie le paquet IPv6, et permet d'obtenir que le paquet IPv6 passe à travers le réseau IPv4 vers la destination au final.
PCT/CN2009/070974 2008-04-08 2009-03-24 Procédé, système et dispositif pour une transmission de paquets WO2009124477A1 (fr)

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CN 200810088952 CN101252524A (zh) 2008-04-08 2008-04-08 一种报文传输的方法、***和装置
CN200810088952.8 2008-04-08

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