虚拟专用网接入设备的设计

Design of the Virtual Private Network Access Server

虚拟专用网通过在公共网传输介质上建立加密信道，连接分布在不同地区的网络和个人用户形成专用网络。根据虚拟专用网用户三种不同的接入方法，文章给出 Ｖ Ｐ Ｎ 接入设备的设计方案、数据处理流程及内部算法。

The Virtual Private Network connects the remote users and the networks in different areas by means of establishing encrypted tunnels over public transmission media. According to the three kinds of accessing ways of the VPN users, this paper gives the design method, the internal algorithm and the data flow of the Virtual Private Network access server.