Linux.com: Review: SmoothWall Express 2.0

“In these days of always-on Internet connections, a firewall
that protects your network from unauthorized access is
indispensable. Though most home routers have some sort of basic
firewall capabilities, their rules for incoming and outgoing
traffic are often basic and arbitrary. An alternative is to run a
Linux-based firewall on old hardware, but configuring this sort of
setup is generally not easy. An exception is SmoothWall, a free
application you can install on any old machine to convert it to a
dedicated hardware firewall. SmoothWall has a friendly interface
and more configuration options than standard hardware
firewalls…”

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