包过滤路由器与包过滤防火墙具有同一功能，如2。1。1部分所述。 The packet filter rout provide the same functionality as the packet filter firewall describe in section2.1.1. 代理防火墙比包过滤器防火墙易于保持更多的上下文 The proxy firewall maintain context more easily than the packet filter firew