虚拟专用网VPN技术分析

Technical Analysis of Virtual Private Network

首先分析了虚拟专用网VPN的概念和体系结构，然后全面研究了VPN的技术基础：IPsec,IP隧道技术及第三方认证技术，并在此基础上，给出了VPN在以下三个领域的具体应用方案，Internet远程访问，内联网Intranet，外联网Extranet.

In this article,the concept of the virtual private network(vpn) and its architecture are first analyzed,and then,the fundamental technologies of the VPN are comprehensively studied:IPsec ,IP tunneling,and the third party authentication. Based on these ,the concrete solutions of the VPN in the following three fields are given ;Internet remote access,Intranet,and Extranet.