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Many modern programs have a feature called NAT negotiation (or NAT traversal). Normally, if Client A wishes to establish a connection to Client B, but Client B has not initiated that connection then the firewall/router/NAT will not typically know what internal computer on the network to send the data to, port forwarding says 'If the NAT/Router recieves data on port X then direct it to computer Y on the network'. NAT negotiation allows Client B to tell his router 'If you recieve a connection on port X, then forward it to my computer'. It is similar to port-forwarding but it is automatic and only in effect while Client B has NAT negotiation turned on.

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