A Review Paper On Firewall

A firewall is a software that establishes a security perimeter whose main task is to block or restrict both incoming and outgoing information over a network. These firewalls are basically not effective and appropriate for corporate environments to maintain security of information while it supports the free exchange of views. In this paper, we study network firewall that helps the corporate environment as well as the other networks that want to exchange information over the network. A firewall protects the flow of traffic over internet and is less restrictive of outward and inward information and also provide internal user the illusion of anonymous FTP and www connectivity to internet.