nanog mailing list archives

Re: Ipv6 help


From: Bjørn Mork <bjorn () mork no>
Date: Thu, 27 Aug 2020 07:58:15 +0200

Brian Johnson <brian.johnson () netgeek us> writes:

1) It needs *much less* IPv4 addresses (in the NAT64) for the same number of customers.

I cannot see how this is even possible. If I use private space
internally to the CGN, then the available external space is the same
and the internal customers are the same and I can do the same over sub
ratio under both circumstance. Tell me how the math is different.

Because NAT64 implies DNS64, which avoids NATing any dual stack service.
This makes a major difference today.


Bjørn


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