Don't host on the same computer you play on -- the server eats up all the CPU and RAM. Instead, do what I do. Get a low end (2ghz p4, 1gb pc2100, 40gb hd, etc...) PC and a router, and spilt the connection between the computers. Then, use the low end PC to function as a dedicated server, and the other to play on. You will need at least a 512kbps (60KB/s) upload speed to host a decent server however.
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