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Method for discovering PMTU (Path Maximum Transfer Unit) and node

A technology of maximum transmission unit and discovery method, which is applied in the field of data communication, and can solve problems such as vulnerability to attack, low efficiency of PMTU, and waste of bandwidth

Active Publication Date: 2012-01-18
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a path maximum transmission unit discovery method and node, which improves the problems of inefficient PMTU discovery, bandwidth waste and easy attack in the current IPV6 protocol

Method used

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  • Method for discovering PMTU (Path Maximum Transfer Unit) and node
  • Method for discovering PMTU (Path Maximum Transfer Unit) and node
  • Method for discovering PMTU (Path Maximum Transfer Unit) and node

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Embodiment Construction

[0065] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0066] The core idea of ​​the present invention is: the source node sends a message with a specified value not greater than the minimum maximum transmission unit of the system, and the message carries a PMTU detection indication, and when the intermediate node receives the message carrying the PMTU detection indication, it forwards the message , and feed back the oversized message to the source node, the oversized message carries the MTU of the outbound interface of the intermediate node, and the source node determines the MTU value of the PMTU route according to the MTU in th...

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Abstract

The invention provides a method for discovering a PMTU (Path Maximum Transfer Unit). The method comprises the following steps that: a source node searches whether PMTU routes corresponding to messages to be sent exist or not, creates or updates MTU (Maximum Transfer Unit) values of the PMTU routes to be specified values which are not more than the minimal MTU value of a system if the PMTU routes corresponding to the messages to be sent do not exist or the MTU values of the searched PMTU routes are invalid, carries out fragmentation treatment the messages to be sent by using the specified values, and sends the messages which carry PMTU detection indication; each intermediate node forwards the messages when each intermediate node receives the messages which carry the PMTU detection indication, and sends the packet-too-big messages to the source node, and carries an MTU of an output interface; and the source node receives the packet-too-big messages returned by each intermediate node, and determines the MTU values of corresponding PMTU routes according to the MTU values carried by the packet-too-big messages. The invention further provides a node. With the adoption of the method and the node provided by the invention, the problem of the loss of data messages in a PMTU learning process is solved, and the number of message interaction in the PMTU learning process is reduced.

Description

technical field [0001] The invention relates to the field of data communication, in particular to a method and node for discovering a path maximum transmission unit (Path Maximum Transmission Unit, PMTU) in the IPV6 protocol. Background technique [0002] With the increasing depletion of IPv4 addresses, a large number of IPv6 network deployments are gradually put on the agenda. Compared with the IPv4 protocol stack, an important advancement of the IPv6 protocol stack is to support the path maximum transmission unit (Path Maximum Transmission Unit, PMTU), that is, When an IPV6 data packet is sent from the source, the length of the data packet must be smaller than the Maximum Transmission Unit (MTU) of the entire path, so that the packet does not need to be fragmented when passing through the intermediate node, which improves the packet forwarding of the network device efficiency. The realization principle of PMTU is as follows: figure 1 As shown, when the message is sent fr...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L29/06H04L47/36
CPCH04L47/36
Inventor 李洪涛于海燕许多
Owner ZTE CORP
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