Any Smoothwall users in here? What'* Smoothwall? It'* an Open-Source software (based on Linux) that you install on a independent computer with 2 or more LAN cards. It'* a complete firewall/VPN/anti-virus and more all packaged into one computer. Basically, its a SUPER router. You install 2 LAN cards into a computer, install the software, plug the LAN wires in, and you have the best firewall around.
I've been running one off and on for about 2 years now. It can be cumbersome to setup and manage, but once its going, its silent and requires very little intervention. Its more for the home LAN geek and is powerful enough to be used in a small business.
All'* it takes is an old computer, a 2nd LAN card(if your computer already as on-board LAN) and your all set.