The Network Firewall of Computer Security Technology

The core thought of firewall technology is to construct a structure relative security sub-net environment in the unsafe Internet environment.This article introduced the basic concept of firewall technology and corresponding strategies to it.It including two main technical method of the firewall: One is filters the technology based on the grouping(Packet filtering) whose representative is the firewall function which realizes on the screening router;the other is based on the proxy technology(Proxy) whose representative is the firewall function which realizes on the application level gateway.5refs.