http://www.howtoforge.com/firewall-management-with-gufw-on-ubuntu-8.04
Gufw is a graphical frontend for managing an iptables firewall on an Ubuntu 8.04 desktop. It is based on ufw and enables you to allow or block pre-configured, common p2p, or individual ports. -- "As we open our newspapers or watch our television screens, we seem to be continually assaulted by the fruits of Mankind's stupidity." -Roger Penrose
