The NAT'ing of the home router will supply an extra layer of security also.
Even better, find an old "boat anchor" or "doorstop" & make a dedicated firewall appliance. There are several dedicated distros out there, SmoothWall Express, IPCop, & M0n0wall come to mind. These install on a hard drive, but there are also several that are floppy based. Sorry, I don't trust floppy reliability, so I can't name any off-hand.
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