The included GUI is system-config-securitylevel (system-config-securitylevel-tui in shell for not using shellgraphics)As a final thought, messing directly with your iptables setup is fun but can become a distracting and wasteful time burner. If you are, or can get comfortable with any of the GUI based firewall setup tools on Fedora I urge you use them. They are not as flexible as direct manipulation but they are less error prone and, unlike the advice I give above, they are not based on someone else's iptables assumptions, which when unknown, (as in this case), will eventually bite you.
Thanks again for the great advice Jeff - I will read and re-read the link you sent until something sinks in. In the meantime I have been (not comfortably) using the iptables command but would rather use one of the "GUI based firewall setup tools on Fedora" you mention above. I did try all of the logical system-config-xxx commands I could find but none that show me a neat list of iptables. Tips-for-Dummies, or better links-for-dummies here would help. Dabblers in an area like this can do more damage than good - like someone who provides an open relay to the entire spam world without knowing it..... :-( ...for instance.
thanks, bob
i personal use firestarter, you will find it in the fedora-extras, so it is installable via yum :-).
Firestarter is easy to configure, completely manageable in gui and powerful, you can set a lot of options with few klicks. It allows also stealthing ports (which might be helpful for you for some ports like ssh..) see some screenshots on its homepage: http://firestarter.sourceforge.net
HTH Roger
