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

A technology of maximum transmission unit and processing method, applied in the field of communications, can solve problems such as system performance degradation, data transmission efficiency reduction, network resource waste, etc., to avoid network resource waste, avoid communication service interruption, and achieve efficient utilization. Effect
CN101695048AInactive Publication Date: 2010-04-14RUIJIE NETWORKS CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
RUIJIE NETWORKS CO LTD
Publication Date
2010-04-14
Estimated Expiration
Not applicable ยท inactive patent

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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.
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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 carried by an Internet Protocol version 4 (hereinafter referred to as: IPv4) network (IPv4 over IPv4, hereinafter referred to as: IPIP) The protocols are all Layer 3 tunneling (Tunnel) protocols of Virtual Private Network (hereinafter referred to as: VPN), which uses tunneling technology between protocol layers, and can retransmit packets at the original sender. The encapsulation is carried out at the remote receiver to decapsulate and restore the original message, so as 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 ...

Claims

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