Business access method and device based on Layer 2 Tunneling Protocol (L2TP)

Abstract

The invention discloses a business access method based on a Layer 2 Tunneling Protocol (L2TP). The method comprises the steps that an L2TP Access Concentrator (LAC) serving as a gateway receives a data message sent by far-end equipment, and judges whether the target IP address of the data message is an enterprise network address or a public network address, if the target IP address is the enterprise network address, forwarding the data message to an L2TP Network Server (LNS) for accessing through an L2TP tunnel, and if the target IP address is the public network address, routing the data message to a public network outcoming interface of the LAC according to a public network routing table entry corresponding to the public network address. The invention also discloses the LAC. After the business access method and the LAC are adopted, the burden of enterprise network LNS equipment is reduced, and the Internet bandwidth utilization rate of an enterprise network is improved.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a service access method and device based on a Layer 2 tunnel protocol. Background technique [0002] Virtual Private Network (VPN) provides a private network connection between the public network and the internal network of the enterprise for mobile employees on business trips, remote office workers and remote small offices to realize remote office. VPDN (Virtual Private Dial-up Network) refers to using the dial-up function of a public network (such as ISDN or PSTN) to access a public network to realize a virtual private network, thereby providing services for enterprises, small ISPs, and mobile office workers. access service. That is, VPDN provides an economical and effective point-to-point connection between remote users and private enterprise networks. VPDN uses tunneling protocols to establish a secure virtual private network for enterprises on the public netw...

AI Technical Summary

Problems solved by technology

In this way, because the traffic to access the Internet (Internet) circles around the LNS of the enterprise network, the access delay is greatly increased.

Moreover, when the remote device accesses the Internet, it enters through the public network interface of the LNS of the enterprise network, and then routes out through the public network interface after decapsulation, occupying the limited egress bandwidth of the enterprise network and increasing the burden on the LNS

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