For something similar check out scottlu's FWD — http://www.scottlu.com/2008/05/fwd-tool-for-peer-to-peer-port.html http://www.scottlu.com/2008/05/fwd-tool-for-p

For something similar check out scottlu's FWD — http://www.scottlu.com/2008/05/fwd-tool-for-peer-to-peer-port.html http://www.scottlu.com/2008/05/fwd-tool-for-peer-to-peer-por.... It uses xmpp as the signalling channel and the ICE implementation from libjingle. This is the P2P stack we built for Google Talk several years ago. If you get this stuff right you can establish a direct connection when both parties aren't behind a full cone NAT — 90+% of the time.