KWallBuilder is a tool for adding iptable rules based on the responses of the user. It tries to insulate the user from the complexities of creating a linux firewall using the iptables mechanism.
The current version supports rules based on network layer protocol and ports.
It supports TCP,UDP and ICMP protocols.
The application requires root privileges. One approach would be to add an entry in the /etc/sudoers file and run the application through sudo.
While KWallBuilder adds iptable rules, it does not guarantee that the added rules will be sufficient to completely protect the system, more details can be obtained from the application's home page.
Though the rpm provided is for SuSE, it can be used on any distribution. The rpm installs in /opt/kde3/ . The application and the icon can then be copied into the KDE directory for the distribution.