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该文系统地阐述了基于路由器的防火墙的工作原理,并以 3COM SUPERSTACK Ⅱ 227 路由器为例,介绍了使用 NETBUILDER(R)SOFTWARE配置防火墙的方法.“,”This paper introduces how a firewall works on router, and the method of building firewalls on 3Com SuperStack Ⅱ model 227 router through NETBuilder(r) software is described in detail.