简析虚拟专用网技术

On Virtual Private Network

首先介绍了虚拟专用网(VPN)的定义、工作原理,接着重点介绍了其核心技术——隧道技术,并阐述了PPTP、L2TP、IPSec三个隧道协议的原理,最后,对VPN市场应用前景做出乐观的判断。

This paper introduces the definition and operating principle of VPN, and then probes its core technology of VPN - tunnel technology. Furthermore, the paper also illustrates the principle of tunnel protocol with PPTP,L2TP、IPSec. Finally, the paper predicts that VPN may be widely used in the future.