Method and system for obtaining path maximum transmission length in channel gateway environment

A technology of maximum transmission length and tunnel, applied in the field of network communication, it can solve the problems of complex implementation and poor versatility, and achieve the effect of simplifying calculation and improving network transmission efficiency.

Active Publication Date: 2006-01-04
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] The purpose of the present invention is to provide a method and system for obtaining the maximum transmission length of the path in the tunnel gateway environment, to overcome the shortcoming

Method used

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  • Method and system for obtaining path maximum transmission length in channel gateway environment
  • Method and system for obtaining path maximum transmission length in channel gateway environment
  • Method and system for obtaining path maximum transmission length in channel gateway environment

Examples

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no. 1 example

[0158] Fig. 12 is the networking diagram of the first embodiment of the system of the present invention:

[0159] Including: source node 121, sender tunnel gateway 122, receiver tunnel gateway 123, destination node 124, node link between source node 121 and sender tunnel gateway 122, receiver tunnel gateway 123 and destination node 124 The node link of the sender tunnel gateway 122 and the tunnel link between the receiver tunnel gateway 123 .

[0160] The sender gateway 122 includes: a tunnel link MTU acquiring means 125 for acquiring the tunnel link MTU, and a tunnel link MTU configuring means 126 for configuring the acquired tunnel link MTU.

[0161] When the tunnel link of the sending side and the tunnel link of the receiving side are established, the MTU value of the tunnel link is obtained by the tunnel link MTU obtaining means 125, and then the value is configured to the sending side tunnel by the tunnel link MTU configuring means 126. on the exit of the gateway.

[01...

no. 2 example

[0163] Fig. 13 is the networking diagram of the second embodiment of the system of the present invention:

[0164] Wherein, the source node 121 includes:

[0165] The path MTU detection message setting device 127 is used to set the required message for detecting the path MTU;

[0166] Probing message length adjusting device 128, configured to adjust the length of the path MTU probing message;

[0167] The path MTU discovery unit 129 is configured to discover the path MTU according to the path MTU detection message.

[0168] When the source node needs to detect the path MTU, at first the detection message is constructed by the path MTU detection message setting device 127, and the DF bit in the message header field is set to be 1, indicating that the message cannot be fragmented, and the length of the message is set to be greater than that of the source node. The MTU value of the node host exit, and encapsulate the ICMP error control message into the message, so that the rece...

no. 3 example

[0169] Fig. 14 is the network diagram of the third embodiment of the system of the present invention:

[0170] Among them, two tunnels are built on the tunnel gateway at the sender side: tunnel 1 and tunnel 2. Logical interface 223 is built corresponding to tunnel 1, and logical interface 224 is built corresponding to tunnel 2. The link MTU of tunnel 1 is configured in On logical interface 223 , the link MTU of tunnel 2 is configured on logical interface 224 .

[0171] The logical interface 223 and the logical interface 224 are respectively coupled to the node link interface 221 and the tunnel link interface 222 . The node link interface 221 is used for communicating with the adjacent nodes connected through the node link; the tunnel link interface 222 is used for communicating with the adjacent nodes connected through the tunnel link.

[0172] After the source node sends a non-fragmentable path MTU detection message (IP message) to the tunnel gateway of the sender through th...

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Abstract

This invention discloses a method and a system for obtaining the largest transmission path length in the tunnel gateway environment. Said system tunnel gateway includes: a tunnel link MTU obtaining device and its assigning device, the tunnel gateway sets up a tunnel link MTU, when a detection message passes through the gateway, it returns back the ICMP control message to the send party according to the tunnel link MTU and the length of the detection message till the send party considers the message will not be segmented. The message length of this time is the path MTU. By this invention, the tunnel gateway can return back ICMP information gateway simply and effectively to un-segmented IP messages or selects the tunnel MTU or link MTU to segment them to segmented IP messages.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method and system for obtaining the maximum transmission length of a path. Background technique [0002] With the development of network technology, the TCP / IP (Transmission Control Protocol / Internet Protocol) protocol ensures the interconnection of various heterogeneous networks. In this way, the transmission of IP packets may pass through various hybrid links, such as Ethernet, FDDI (Fiber Distributed Data Interface), ATM (Asynchronous Transfer Mode), etc. When two hosts communicate through the Internet, a long IP message often needs to be fragmented because it exceeds the limit of the MTU (maximum transmission length) of the underlying link when it is transmitted. MTU refers to the maximum data volume of a physical frame allowed by a specific network. The link layer has an MTU, which limits the maximum transmission length of a data frame. Different network typ...

Claims

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Application Information

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IPC IPC(8): H04L29/02H04L29/06
Inventor 薛明
Owner NEW H3C TECH CO LTD
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