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Nelson Minar
Blog licensed under a Creative Commons License
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Network address translation is the bane of P2P.
There's a black art for establishing UDP communication
between two peers behind NATs by having a third party introduce the peers
and fooling the NAT routers into routing the packets. Games have been
doing this for a few years. I see now it's
well documented
by Bryan Ford.
Bryan also has a draft RFC for NAT P2P. It's a great document and includes a technique I'd love to see developed further: opening TCP connections through NATs with a "simultaneous open":
If, however, the SYN packet arrives with
source and destination addresses and port numbers that correspond
to
a TCP session that the NAT believes is already active, then the NAT
will allow the packet to pass through.
It requires predicting TCP sequence numbers, though, so I fear it's
impractical.The only alternate I know of is UPnP Nat. There's hardware router support and a free Linux implementation.
As seen on decentralization
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