Research on Technology Development of Packet Filtering in Firewall
防火墙包过滤技术发展研究

Firewall can be classified as packet filter and application agent.In this paper,the packet filter method was analyzed from the structure of data package.First the key problem of packet filter is proposed,then the two possible tendency of the packet filter method are thoroughly investigated.Finally,several cases are used to illustrate the combination of the two tendency.