I just learned that m0n0wall now supports IPv6, which is great news. Lack of IPv6 support is actually why I stopped using m0n0wall years ago. Since that time I've come to miss it dearly. Now that my only gripe has been addressed, I might consider giving it another try.

In case you are wondering just what m0n0wall is, here is an excerpt from their website:

m0n0wall is a project aimed at creating a complete, embedded firewall software package that, when used together with an embedded PC, provides all the important features of commercial firewall boxes (including ease of use) at a fraction of the price (free software).

If you need a router and have a spare machine, give m0n0wall a try.