'Upgrading' NAT64 to 464XLAT?

[Lorenzo Colitti]

On Tue, Nov 26, 2013 at 5:55 PM, Doug Barton <dougb at dougbarton.us> wrote:

> Which uses more IPv4 addresses, a traditional IPv4 NAT or 464xlat? At the
> end of the day the PLAT still has to talk to the v4 net.
>

Oh, I forgot - the answer to that question is that the traditional IPv4 NAT
uses much more IPv4 space. This is because the traditional IPv4 NAT needs
private IP addresses to number the endpoints.

If you have fewer than 10M subscribers this might not matter, but if
you're, say, a mobile operator with 50M subscribers, you either number
endpoints using RIR space, or you number them with bogon space, or you have
to use overlapping RFC1918 realms. RIR space is about to run out. Bogon
space is risky, and overlapping RFC1918 is painful for operations and
causes application breakage.
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