虚拟专网是分布在不同地方的企业内联网或在移动环境中的企业员工通过公共网络(如因特网)互联,使用户用较少的费用,却如同在本地专网上通信的网络。它采用加密方式传输信息,使数据不会被窃取。 虚拟专网的关键技术是信息在公网中的传输技术,现多采用隧道技术。隧道技术具有相对简单、有效和易于管理的特点。现有的许多网络接入交换设备、接入服务器和广域网路由器都支持相关的隧道技术标准。 Virtual private network is distributed in different parts of the enterprise intranet or enterprise employees in the mobile environment through a public network (such as the Internet) to connect, so that users with less cost, but as in the local private network communications network. It uses encryption to transfer information so data will not be stolen. Virtual private network is the key technology of information transmission in the public network technology, are using more tunneling technology. Tunneling technology is relatively simple, effective and easy to manage. Many existing network access switching equipment, access servers and WAN routers support the relevant tunneling technology standards.