"I've mentioned Soekris single-board computers (SBC) many a time
as great choices for routers, firewalls, and wireless access
points. They're small, quiet, low-power, and sturdy.
"So here at long last is a howto that attempts to answer your
hardware questions, and then we'll get into building a sturdy
firewall using Pyramid Linux. I just happened to find a deal on a
used Soekris Net4521, which handles both wired and wireless
networking, so that's the model we'll talk about..."