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answers:

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+2  Q: 

UDP hole punch possible?

I'm trying to see if UDP hole punching is possible behind a certain NAT, but I've found that when the computer behind the NAT sends out UDP packets to two different IPs to the same port while being bound to the same port, the NAT assignes two different external port numbers. So behind this particular NAT, I believe UDP hole punching is impossible, is this correct?

Thanks

A: 

Not necessarily. The router might be willing to respond to IGD.

Martin v. Löwis  2010-08-21 00:25:59
Thanks, tried that, it did not. Not surprising, it's actually a cellular data connection. Worth a shot at least. The only other thing I cant think of is port guessing, but they seem to be assigned quite randomly. Nuts.
nemasu  2010-08-23 15:59:52

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