Study On Key Technology Of Network Firewall

Internet is a global information network,which results from inter-connected computers all over the world. Recently,the security problem of Internet causes much more attention of people Using firewall to protect network.Security become more and more popular.In the background of the developing Internet and its demanding requirement for network information security,this paper is to study some theories and key technology of network firewall system. At flrst,this paper analyses the security problems in the TCP/IP Suite,which is very widely used today,and network services based on TCP/IP Suite,also points out the weakness of Intemet.Then this paper analyzes and researches Firewall,which solve the security of Intemet/Thtranet,including: packet filtering~ proxy technology and authentication tecbnology,ect. This paper research IPSec protocol,the paper first analyzes IPSec protocol and presents implementation on Linux.And IPSec is the key technology of VPN, the paper also analyzes the IPSec tunneling technology in detail, and presents design model and implementation of VPN based on IPSec.And a firewall based on packet fl1tering~ proxy technology and identification technology is designed and implemented.Finally,this paper puts forward suggests about how to develop network firewall.