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I think another reason John doesn't ban IP addresses is because it is possible to falsify them or generate fake ones. Some friends of mine lived in a house together and wanted to hook all their computers up to the cable hookup w/o paying extra (it was like 5 guys, so those 4 extra lines would have been pricey). Somehow one of them made fake IP addresses so that it appeared the other four guys were on their own hookup and not all hooked up to one connection via a hub. I don't know how to do any of that, but I'm sure many people do.
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