486 PC as a firewall device?

Hello SuSE folkz, I've got an old 486 DX 75MHz PC with PCI and ISA slots. I'd like to to utilize this dinosaur as a firewall box using two 100MB/sec PCI NICs. Could somebody please give me an idea what system hardware resources are mostly involved in performance of the firewall device? Processor speed, front bus speed, internet connection, or something else? Can I get a best performance out of this junk? Thank you in advance. Alex -- MS Windows users should be covered under the Americans with Disabilities Act! --------------> Try Linux and you'll understand why <--------------