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I would like to forward ports automatically with my application, however UPNP is off by default, but Spotify was able to forward ports when even UPNP is disabled, same applies to uTorrent and others.

How do I force port forwarding, or Enable UPNP on rounter, forward port and disable it again?

John Smith
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  • Possibly a daft question but how do you know that Spotify is forwarding ports? It could conceivably work by making an outbound connection from your network to an external server, relying on routers only blocking incoming connections. – simonc Jul 12 '13 at 11:48
  • I can see it on web site of router, where you can manage it. – John Smith Jul 12 '13 at 19:45

1 Answers1

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Maybe these services use UDP hole punching.

See: Wikipedia article

Feyd
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  • Okay, then it sounds like NAT Port Mapping Protocol. But I don't know if it's disabled when UPnP is disabled too. – Feyd Jul 11 '13 at 17:01