本文介绍了利用VPN技术，在廉价的Internet上建立虚拟专用网络，使用VPN组网实现远程用户、分支机构与总部联网，从而为企业提供了一个高安全性、高性能、高可用性和多协议的网络环境。-This article describes the use of VPN technology, low-cost Internet to establish a virtual private network, use network VPN remote users, branch offices with headquarters in networking, in order to provide enterprises with a high-security, high performance, high availability and multi-protocol network environment.