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Is there another method of auto-port forwarding, in case for some reason a user doesn't have uPnP enabled on the router? For programs like Skype, or IRC, how do they do it?

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closed as off topic by womble, Holocryptic, Zoredache, mdpc, Scott Pack Dec 6 '12 at 17:29

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Take a look at hole punching technique.

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Hm.. Very interesting read, thank you. –  Drise Jul 30 '11 at 18:12

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