Internet安全——包过滤与防火墙技术

Internet Security —— Packet Filter and Firewall

介绍了Ｉｎｔｅｒｎｅｔ的常用安全技术：包过滤与防火墙技术，并分析了包过滤与防火墙的工作原理，给出了包过滤与防火墙与网络七层结构的对应关系。最后对防火墙的建立提出了指导性原则。

This paper discusses two common security technologies:packet filter and firewall, and analyzes the working princtples of this two security technologies. It also presents the corresponding relations among paoket filter,firewall and network seven layer architechture. The paper brings forward some instructing rules of the building of firewall at last.