GRE 与 IPSec VPN 工程应用研究

摘要

本文分析了 GRE 隧道与 IPSec VPN 的主要技术，阐述了 GRE 与 IPSec VPN 的特点与工程应用场景，并且分析了两者的应用缺陷，提出了 IPSec VPN 与 GRE 隧道结合使用的特点与应用场景，并且阐述了 GRE over IPSec VPN 与 IPSec VPN over GRE 的差别。%This paper describes the main technologies and the features and applications defects of IPSec VPN and GRE tunnel. This paper presents an application scenario which uses IPSec VPN and GRE together. And at last, this paper describes the difference between GRE over IPSec VPN and IPSec VPN over GRE.