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You need to get a router. What you have right now is one machine drawing a real world IP address from the cable modem, and the other failing to draw any IP address (it appears that instead of billing you for a second IP address, they have it set to only give out one IP address). Both machines have to have a valid IP address in the same subnet in order to communicate with each other. A router will take care of this easily - it takes the one IP address from the ISP and "translates" it to multiple machines using a range of "private" IP addresses. A router also gives you the advantage of a hardware firewall.
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