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给出了作者对ＶＰＮ的理解，分析了支持ＶＰＮ实现的几个主要隧道协议的特点，简要探讨了Ｎｏｖｅｌｌ和Ｍｉｃｒｏｓｏｆｔ ＶＰＮ的实现，最后，给出了一个应用层 ＶＰＮ的方案和实现。
This paper gives the author’s understanding of VPN, analyzes the features of several major tunneling protocols that support VPN implementation, briefly discusses the implementation of Novell and Microsoft VPN, and finally gives a scheme and implementation of application layer VPN.