Any version of *nix but you have to be a network wallah to get that going.
Check out Astaro in parallel to Smoothwall. Astaro has a lot of the same kind of features, DNS, DHCP, proxy, anti-spam, anti-virus, blah blah blah
m0n0wall is a great distro if all you want is "router" functionality. You can boot from CF or USB and it is extremely lightweight so you can easily build a no-moving-parts system.
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He either fears his fate too much, or his deserts are small, that dares not put it to the touch, to gain or lose it all.
- James Graham
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