[tor-relays] Firewalls

Hi to all, I have a simple question, what is the best firewall solution ? With sourcecode and must be opensource. What do you mean ? regards Steffen TorGate torgate(at)linux-hus.dk OpenGPG 7FD5 65EF A4EF EEF3 7A13 4372 8409 49D6 01A2 0890