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I can't give you a very specific answer, but the router keeps track of where a request is going and who sent it. When the external source responds, the router simply checks to see which device attempted to contact the external source initially, and forwards the response to that device. If you need more information, look into NAT.– Jack HumphriesCommented Dec 26, 2012 at 3:17
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This question belongs to Superuser.com– TimothyPCommented Dec 26, 2012 at 3:18
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