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Why doesn't Xbox Live require Port Forwarding?

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I'm wondering how Xbox Live game hosting works. I'm unable to host PC games without setting up Port Forwarding. Why can I host Xbox games without any hassle? The goal behind my question is bringing this convenience to PC multiplayer games.

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They're probably using an external 'introducer' server and some NAT cracking technology. At least this is how most large p2p systems work (our game ;), dc, battlenet)

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Nat punch-through using an introducer. The "introducer" in this case is the Live! matchmaker itself.

Also, X-box seems to only use UDP, emulating TCP on top of it. And it seems to always send traffic on a single port. Take a sniffer to your network when it's running sometime.

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