Hi,
I have used Firestarter and Guarddog, and Guarddog appears to be more stable. I use Redhat 9 aswell and installed the 2.4.21-15 unsupported kernel as required bridging support.
Although Firestarter has a better GUI with realtime hits, it just seemed to not update the IPtables correctly when I made changes.
Hope this helps..
Lame.
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