You might want to look at apf-firewall.
Quote:
Description: easy iptables based firewall system
Advanced Policy Firewall (APF) is an iptables(netfilter) based firewall system designed around the
essential needs of today's Internet deployed servers and the unique needs of custom deployed Linux
installations. The configuration of APF is designed to be very informative and present the user with
an easy to follow process, from top to bottom of the configuration file. The management of APF on a
day-to-day basis is conducted from the command line with the 'apf' command, which includes detailed
usage information and all the features one would expect from a current and forward thinking firewall
solution.
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There is also firestarter, fwbuilder and guidedog if you must have a gui.
Please do not sue Debian, I use it faithfully and I would be lost without it.
jdk
Debian Firewall management.
