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Method and device for path maximum transmission unit (PMTU) learning

A technology of message and communication equipment, applied in the field of path maximum transmission unit learning, can solve the problems of slow learning speed, waste of network bandwidth, waste of network bandwidth, etc., and achieve the effect of improving learning speed and saving network bandwidth

Inactive Publication Date: 2012-07-18
NEW H3C TECH CO LTD
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  • Abstract
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Problems solved by technology

[0015] It can be seen that learning PMTU in the prior art needs to be detected by hop by hop, which will not only lead to slow learning speed, but also increase network traffic and waste network bandwidth, especially as figure 1 In the case of decreasing hop by hop as shown, the slow learning speed and the waste of network bandwidth will be more serious

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  • Method and device for path maximum transmission unit (PMTU) learning
  • Method and device for path maximum transmission unit (PMTU) learning
  • Method and device for path maximum transmission unit (PMTU) learning

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0045] In the embodiment of the present invention, the forwarding device modifies relevant messages during the establishment of the TCP connection, so that PTMU learning can be completed during the establishment of the TCP connection. Among them, the TCP connection establishment process includes three handshakes, the synchronization (Synchronize, Syn) message of the first handshake, the synchronization response (Syn+Ack) message of the second handshake, and the response (Ack) message of the third handshake. arts.

[0046] After the three-way handshake is completed, the TCP connection can be successfully established and communication packets can be exchanged. Therefore, if the PTMU learning can be completed during the establishment of the TCP connection...

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Abstract

The invention provides a method and a device for path maximum transmission unit (PMTU) learning. In a transmission control protocol (TCP) connection establishment process, forwarding equipment modifies a value of a maximum segment size (MSS) option in a Syn message, so that the value of the MSS option in the Syn message finally can be modified into the minimum of maximum transmission unit (MTU) values of all forwarding equipment in a transmission path; moreover, a final value of the MSS option in the Syn message is also carried by a Syn+Ack message and an Ack message, so that communication equipment can learn a PMTU by utilizing the value of the MSS option in the TCP connection establishment process, and is not required to learn the PMTU hop by hop in a communication process after the establishment of TCP connection; and therefore, PMTU learning speed can be increased, and a network bandwidth occupied by the PMTU learning can be saved. A change in the MTU value of the forwarding equipment also can be adapted by modifying a value of an MSS option in the Syn+Ack message by the forwarding equipment.

Description

technical field [0001] The present invention relates to a path maximum transmission unit (Path Maximum Transmission Unit, PMTU) learning technology for Transmission Control Protocol (Transmission Control Protocol, TCP) communication, and in particular to a method and device for PMTU learning. Background technique [0002] In the TCP transmission of the sixth version of the Internet Protocol (IPv6), two communication devices (such as a PC and a server) can use the TCP connection to exchange communication messages after establishing a TCP connection, but the forwarding between the two communication devices A device (for example, a router) can only forward communication packets, but is not allowed to fragment the communication packets, that is, the size of a communication packet can only be determined by the communication device at the source end of the communication packet. [0003] If the size of the communication message exceeds the maximum transmission unit (Maximum Transmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06H04L49/111H04L47/36
CPCH04L29/06095H04L69/16H04L47/36H04L47/365H04L49/3072H04L49/9057
Inventor 崔晓会
Owner NEW H3C TECH CO LTD
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