This paper adopts Linux open source as development roof to construct Virtual Private Gateway (VPN) by using IPSec protocols in network layer based on special network stacks and integrate VPN gateway into firewall system.

• 本论文选用了开放源代码的Linux操作系统作为开发平台,在自主开发的专用协议栈基础上,采用网络层的IPSec协议族实现了虚拟专用网(VPN)网关,并集成于防火墙系统中。