The importance of Ratproxy by ZDNet’s Dana Blankenhorn — In a way it’s a server-side anti-viral, aimed at catching injections of malware as they happen. Thus any Web host which wants to be honest and fight the bad guys can, proactively and in the background.

A computer-related firewall, whether its composition is hardware or software, has the same basic definition where the term fire refers to a security threat. Firewalls don’t prevent attacks, but mitigate them by only allowing specific ports to be opened to a limited number of hosts inside a network.

Here is a complete tutorial on how to setup Firestarter Firewall in Linux by Ken Hess.

Firestarter How-To