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虚拟专用网技术是当前的热点技术之一．受到了人们的广泛关注，其研究和开发具有十分重要的意义。本文分析了Ｌ２ＴＰ协议的特点，并描述了通过Ｌ２ＴＰ协议实现虚拟专用网的网络结构、隧道实现方式以及会话通信过程。
Virtual private network technology is one of the current hot technologies. Has attracted people’s extensive attention, and its research and development are of great significance. This paper analyzes the characteristics of L2TP protocol and describes the network structure, tunnel implementation and session communication process of virtual private network through L2TP protocol.