Analysis of Firewall Technology and Revelations

This paper aims for the security problem that Internet faces with and expounds the purpose and effect of the installation of firewall. The basic concept and architecture of firewall are introduced and the main technologies such as Packet Filtering, Application Level Gateways and Proxy Service which can be applied to realize firewall together with their own advantages and disadvantages are discussed. Based on these analysis,some revelations of correct configuration ,maintenance and verification of firewall are also summed up. The limitation of traditional firewall and attributes which a new generation firewall should have are pointed out at the end of the paper.