Hej.
Dessa länkar är tips för er som gillar att bygga brandväggar.

http://www.simonzone.com/software/guarddog/
Guarddog is a firewall configuration utility for Linux systems. Guarddog is aimed at two groups of users. Novice to intermediate users who are not experts in TCP/IP networking and security, and those users who don't want the hastle of dealing with cryptic shell scripts and ipchains/iptables parameters.

http://www.simonzone.com/software/guidedog/
Guidedog is an advanced routing/network configuration utility for KDE 2 and 3 running on Linux 2.4 based machines. Using Guidedog you can easily activate packet routing/forwarding and also more advanced networking such as IP masquerade and Port Forwarding.

Kolla gärna de "screenshots" som finns i respektive länk.