全状态防火墙双机热备份的设计与实现

介绍了全状态防火墙的基本概念，阐述双机热备份系统的组成和工作原理，接着详细描述全状态包过滤防火墙的双机热备份模块的设计，包括硬件框架和软件框架，防火墙系统工作状态定义和演变，最后从双机通信、双机同步、双机切换三个方面详细阐明了双机备份系统中的双机控制。

Research and Implementation of Hot Standby in State Inspection Firewall

First introduces the basic notion of the state inspection firewall,expatiates architecture and working principle of the Hot Standby System,and explains the design of Hot Standby System in state inspection firewall,including hardware framework,software framework,the defination of the firewall's working state,finally this paper discribes the controlling between two firewalls,mainly from the following three aspects:communication,synchronization,switching.