基于链路自适应的移动VPN系统网关设计与实现

移动网络环境存在着诸多的安全威胁，为保证信息传输的安全性，提出了在移动网络中建立VPN通道的移动通信解决方案；并针对NAT／防火墙与VPN不兼容问题设计实现了一个基于IPSec的移动VPN网关原型系统。该系统支持NAT和防火墙穿越，具备通信链路自适应性，较好地解决了VPN网关在移动网络下的局限性。

Design and Implementation of Mobile VPN Gateway Based on Self-adaptive Communication Mechanism

As many threats exist in mobile network, it is necessary to ensure the safety of information transfer. In this paper, a mobile information transfer solution is presented under the mobile network surroundings. Aiming at the incompatibleness problem between NAT/firewall and VPN, an IPSec-based VPN Gateway for mobile devices is designed and implemented. This gateway supports the penetration of NAT and firewall with self-adaptive communication mechanism for different situations, which solves the limitation of VPN gateway under mobile network..