so i have a doubt here, i have this old computer and i was thinking about putting it as a firewall, maybe running smoothwall, but i'm kind of confused.
I've 2 computers beside that one, now i'm sharing the internet trough a crossover, my question is how could i share the internet to those 2 computers, but first passing trought the firewall?
I hope you understand my question, do i need to buy a router, do i need to put like 2 ethernet cards on the firewall in order to share it?
If you could give me a little help here, i would really appreciate it.

Thanks in advance.