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本文开始介绍网络的安全现状，尔后详细说明我们设计的一个防火墙系统的体系结构和功能结构，另外还介绍包过滤路由器的配置规则。
This article began to introduce the current status of the network security, then a detailed description of the design of a firewall system architecture and functional structure, in addition to packet filtering router configuration rules.