This article briefly introduced the VPN concept,the principle of work and the application pattern to establish own private network through the public network and has summarized the development tendency of VPN technology.

• 本文简要介绍了一种通过公共网络来建立自己的专用网络的技术VPN的概念、工作原理和应用模式,并简述了VPN技术的发展趋势。