Hello
Still unknown what you are trying to do
sme has a firewall in it If you want to just put a firewall in your network system you can use whatever one you like
I use coyotelinux it's easy to use and just runs from a floppy
I have tried most of the others and have used sme in the gateway mode but don't feel the version 6.0 port-forwarding is that good seems to have a problem inside my domain
also have done some testing on the firewall protection and found coyotelinux to be the best at stopping intrusion I like sme software very much but don't want everything on one box
my firewall is an old 233 with 16 megs of ram 2 network cards no hard drive or cdrom it will work on less I use the web interface to make any changes when needed and it just sits and runs coyotelinux
You can use sme for a 1 box setup in gateway mode with 2 network cards and I think there is a firewall rules contrib out there I recall
Again you have not really said what you are trying to get done