Study Of VPN Technology Based On ADSL

Along with the business network application's unceasing development, the enterprise network's scope also unceasingly expands, develops from a local network to the trans-region, the cross city is even the cross national network. Meanwhile along with Internet's rapid development, Internet already proliferated the world, from the physical sense Internet connects mutually the world's resources. Compared to the traditional dedicated leased line's expensive complex networking way, whether enterprise could rely on the Internet to build their business network? But Internet is open to the world, and if the enterprise information via the Internet to transmit, it possibly has many problems in the security. How to make use of the existing Internet to establish the safety and security of proprietary enterprise network? The technology of virtual private network (VPN) becomes a very good solution.This article elaborated the VPN basic principle and several kinds realizations: IPSec, L2TP/PPTP, SSL VPN, MPLS and have compared their advantages and disadvantages, and the scope of application.In view of the current telecommunications operators' quo of the existing public IP network' s status it issues how to achieve VPN and give a briefing on the selection of network equipment and operational configuration. In the end, it has a brief summary and outlook.