【摘要】 隧道技术解决了移动节点的移动性问题,对移动IP中使用的3种隧道技术做了简要的介绍。反向隧道的建立使得位于外地网络上的移动节点可以在设置了入口过滤路由器的外地网络上建立通信连接。通过在移动IP中应用IPSec协议,可以为移动IP提供有效的安全服务,使移动IP用户可以访问受防火墙保护的VPN,而不破坏原有的安全结构。更多还原

【Abstract】 Tunneling is a method to solve the problem of host mobility. Three kinds of tunnel protocol are introduced: IP encapsulation with in IP, minial encapsulation and generic routing encapsulation. The establishment of reverse tunnel makes it possible for the MH from foreign network to communication in the network whose touter has access filters. Through the application of IPSec protocol in mobile IP, safety service can be provide to mobile IP, which enables mobile IP customers to access VPN protected by firewall without destroying existed safety structure.更多还原