Discovering and processing method of maximum transmission unit of tunnel and device as well as router

Abstract

The invention discloses a discovering and processing method of a maximum transmission unit of a tunnel and a device as well as a router, wherein the method comprises the following steps: sending a first detection message carrying DF positions to the router of a receiver; when an unreachable message of a target returned aiming at the first detection message is received, sending a second detection message carried with DF positions to the router of the receiver according to a learning path MTU of an MTU value of the router of the receiver in the unreachable message of the target, wherein the length of the second detection message is the MTU value of the learnt path; and when the unreachable message of the target returned aiming at the second detection message is not received under a first preset condition, executing the operation of sending the first detection message to the router of the receiver. The embodiment of the invention can avoid the problems that due to the fragmentation of the message according to smaller MTU value, the network resource is wasted, the working performance of a system is reduced and data transmission efficiency is reduced, as well as message loss and interruption of communication services caused by message sending according to larger MTU value.

Description

technical field [0001] The invention relates to communication technology, in particular to a method and device for discovering and processing the maximum transmission unit of a tunnel, and a router. Background technique [0002] Generic Routing Encapsulation (hereinafter referred to as: GRE) and another IPv4 network data (IPv4over IPv4, hereinafter referred to as: IPIP) protocol carried by an Internet Protocol version 4 (hereinafter referred to as: IPv4) network Both are virtual private network (Virtual Private Network, hereinafter referred to as: VPN) layer-3 tunneling (Tunnel) protocols, which use tunneling technology between protocol layers, and can retransmit messages at the original sender. Encapsulation, decapsulation and restoration of the original message at the remote receiver to achieve the purpose of traversing the network. Among them, the GRE tunnel can encapsulate the packets of certain network layer protocols, such as the IP protocol and the Internet packet ex...

AI Technical Summary

Problems solved by technology

In this way, even if the MTU value in the tunnel path is modified and becomes larger, the sender must perform fragmentation on the sender interface according to the smaller MTU value learned before each time before sending a packet, resulting in waste of network resources and system failure. The work performance is degraded, and the data transmission efficiency is reduced; while the MTU value in the tunnel path is modified and becomes smaller, the sender is still sending the message according to the original larger MTU value, but the length of the message is greater than the modified MTU in the tunnel path When the value is too high, it may cause the loss of the message, which will cause the interruption of the communication service.

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