[LAC-TF] Feedback on NAT-PT / NAT64 requirements

Iljitsch van Beijnum iljitsch at muada.com
Thu May 22 13:17:15 BRT 2008

Hi everyone,

Please excuse me for writing in English.

At the LACNIC meeting a week from now, we'll get the opportunity to  
connect from the temporary IPv6-only network to the regular IPv4  
internet using a NAT-PT translator.

The IETF defined NAT-PT in RFC 2766 but then deprecated this mechanism  
in RFC 4966 because there is a number of issues, mostly with the fact  
that NAT-PT requires the generation of synthetic (fake) AAAA records  
based on the real A records in the DNS.

The IETF is now looking to revive the NAT-PT (or NAT64) mechanism. We  
have the following draft that describes the requirements for IPv4/IPv6  
coexistance and transition in general, and a new version of NAT-PT in  


In addition to the specific requirements, we're very much interested  
in learning whether network operators feel NAT-PT is a good transition  
mechanism for the period between the moment we run out of IPv4  
addresses and the moment (more or less) the entire internet supports  

Iljitsch van Beijnum

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