Sed (sed) Firewall Technology Research

This paper mostly concern design and implement an IP packet filter for SED. Network Firewall , including static packet filter and statefl.tl-inspection packet filter. Firstly, the paper introduces technologys relating to the topic, and gives a thorougly overview of network hacking methods and defending ways ; then analyses the application mechanism of SED firewall抯 TCP/IP protocol suite ;and e~cpatiates at length on the ideas and methods of how to design and implement a packet filter after discussing these basic topic.