This article continues the series of articles on Firewall Builder,
a graphical firewall configuration and management tool that
supports many Open Source firewall platforms as well as Cisco IOS
access lists and Cisco ASA (PIX). This article explains key principles of the policy or
access control rule sets in Firewall Builder. I plan to
demonstrate examples of policy rules and how they translate
into iptables, pf and Cisco IOS and PIX
configurations in the next article of the series.