以基于IPSec 的虚拟专用网(VPN)系统为研究，在提出IPSec 协议体系结构的同时，重点分析了其主要模式与工作原理。分析了基于IPSec 的VPN 系统中的隧道、加解密、用户认证和访问控制等四项关键技术。最后给出了应用协议的一个实例。关键词：VPN IPSec 隧道技术 加密技术 认证技术 访问控制Abstract： The body under study is the VPN system based on The IPSec architecture are introduced and the main mode and principle of IPSec are detailed described here.It also makes a detaied researched and analysis on the four key technologies in VPN.Finally,a case study of using netfilter as a firewall was given.Key words：VPN, IPSec, tunneling technology, encryption technology, authentication technology, access control
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