设计和实现一个简单的虚拟专用网络的机制(VPN).使用socket编程实现了ip的伪装和虚拟专用网络的建立。运行环境linux，内含源代码、配置文件以及使用说明。是学习socket编程和网络通信的好东西。-Design and implementation of a simple mechanism for virtual private network (VPN). Use the ip socket programming camouflage and virtual private networks. Operating environment linux, containing the source code, configuration files and instructions for use. Is to learn socket programming and network communication a good thing.