Method and device for sharing load of data message used for L2TP (layer 2 tunneling protocol) networking

Abstract

The invention provides a method and a device for sharing the load of data message used for L2TP (layer 2 tunneling protocol) networking. The method comprises the following steps: an LAC (L2TP access concentractor) establishes L2TP subtunnels which are subordinate to an L2TP main tunnel together with an LNS (L2TP network server) according to the number of target IP addresses reached the L2TP main tunnel, allocates tunnel source IP (internet protocol) addresses and tunnel target IP addresses to each L2TP subtunnel and multiplexes the L2TP sessions between the LAC and the LNS in sequence on the established subtunnels respectively; the LAC determines the L2TP subtunnels on which the L2TP sessions are multiplexed when receiving the data message in any one L2TP session, packages and forwards public network IP heads for the data message to avoid the congestion due to too heavy load of a part of links, wherein the packaged public network IP heads comprise the tunnel source IP addresses and the tunnel target IP addresses of the L2TP subtunnels on which the L2TP sessions are multiplexed.

Description

technical field [0001] The present application relates to network communication technology, and in particular to a data message load sharing method and device applied in Layer 2 Tunneling Protocol (L2TP: Layer2Tunneling Protocol). Background technique [0002] Virtual Private Dial-up Network (VPDN: Virtual Private Dial-up Network) uses the dial-up function of the public network to access the public network to realize a virtual private network, providing an economical and effective point of contact between remote users and private enterprise networks. point-to-point connection. [0003] L2TP is currently the most widely used VPDN tunneling protocol, which is used to build a virtual private network. The typical networking of the constructed virtual private network is as follows: figure 1 As shown, it mainly includes: remote device, L2TP access concentrator (LAC: L2TP Access Concentrator) and network server (LNS: L2TP Network Server). Wherein, the remote device is a remote u...

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Problems solved by technology

However, this will cause the LAC to encapsulate the same public network IP header for all L2TP Session data packets, where the public network IP header mainly includes: L2TP tunnel source address, etc.

Since all L2TP Session data packets encapsulate the same public network IP header, in the existing link load sharing mechanism, the public network IP header of the data packet is HASHed according to the hash (HASH) algorithm to select the link. When the link is connected, all L2TPSession data packets will be distributed to the same link for transmission, resulting in the overload of the link and the waste of other links

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