Thanks jharris, I looked it up.
I ended up going to Circuit City, and I bought a D-Link 4-port router/firewall for $100, but I get a $50 mail in rebate. It has NAT, browser configuring, and ip masking. I think that coupled with ipchains and shutting down all non-essential ports will pretty much make sure that MOST crackers (noticed I used the correct term) wont get in.
For the price it is hard to go wrong. I simply do not have the moneyright now to set up another computer, nor do I have the room.
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