"Listenless" TCP over NAT?

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Hi!

Recently someone mentioned on this (or maybe other...) list a seldom used
technique of establishing a TCP connection without one host listening on a port,
but but acting as "clients" and connecting to the peers port.

My question: Can this be used to establish a TCP connection between two hosts that
are both behind a (P)NAT router ?

(the idea being: NAT router lets outgoing connections thru, and in this case both
NAT router would  see an "outgoing" connection)

If yes, this would simplify the life of many users :-)

Regards,
David


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