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Find the last NAT NATFW reserves external address message Reserves IP address/port at most external NAT (edge NAT) Gives host a chance to receive data originated in public network Usable for example for SIP (early media) Currently NATFW NSLP is searching for the last NAT Give NSLP message a target (SIP server) and the last NAT will return public address Reuse reservation for later create message coming from public network Is it appropriate to let the NSLP find the last NAT? Reserve message is send to fake target Reserve message runs opposite way of data to come later Or is it ‘special routing’ better done by the NTLP |