Advanced networking question

[Roma Norgy]

OK, here's what I want to do, you tell me if it's possible. I want to have a poker computer and a computer network both with their own separate cable modems for internet access. I'd like my poker computer to be able to access the computer network, but other computers should not be able to access my poker comp. I'd probably do this by connecting my poker comp through a router to my "server" comp via a second ethernet port.

Can I accomplish this just by properly configuring a router? Do I need special software to keep things secure? Any cool programs out there that might make this easier?

I also plan on implementing the advice given in this post. So if what I want to do compromises any of those security steps, let me know.

Thanks in advance...