It introduces the operation principle, function and basic requirement of Access VPN. These protocols of VPN in common use are analyzed and compared. Taking PPTP for examples, it gives the configuration method of implementing VPN.

• 介绍了AccessVPN的工作原理、功能及实现的基本要求,对VPN常用的协议进行了分析、对比,并以应用比较广泛的PPTP协议为例,给出了软件实现虚拟专用网的具体配置方法。