[Cryptography] peering through NAT

jamesd at echeque.com jamesd at echeque.com
Thu May 9 07:45:14 EDT 2019

NAT makes it hard to contact a computer behind nat, but Bitcoin core has 
no problems with most nats, even when behind multiple levels of nats.

It does something to tell the nat to direct incoming messages on port 
8333 to it, without the end user usually needing to manually set up port 

What is the protocol to tell a nat to forward incoming messages?

What happens if there are two machines both running bitcoin core behind 
the nat?

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