Re: [v6ops] I-D Action: draft-ietf-v6ops-nat64-experience-04.txt

Tore Anderson <tore@fud.no> Wed, 20 November 2013 09:16 UTC

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Date: Wed, 20 Nov 2013 10:16:21 +0100
From: Tore Anderson <tore@fud.no>
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To: Lorenzo Colitti <lorenzo@google.com>
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Cc: "v6ops@ietf.org" <v6ops@ietf.org>
Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-nat64-experience-04.txt
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* Lorenzo Colitti

> On Thu, Nov 14, 2013 at 5:55 PM, Tore Anderson <tore@fud.no
> <mailto:tore@fud.no>> wrote:
> 
>     One could use a ULA prefix for DNS64/NAT64, which would make native
>     IPv4 be preferred according to RFC 6724.
> 
> But then if you have IPv6-only with 464xlat you end up preferring
> 464xlat over NAT64.

True, although the question was about dual-stack UEs with native IPv4.

I suppose that if one additionally has to support single-stack UEs with
NAT64/464XLAT one can't have it both ways, unless those UEs modify their
RFC6724 policy table to add a separate low-precedence entry for the
464XLAT address (and possibly one for the NAT64 prefix as well).

But then again, it might not matter much these days, as it becomes more
and more uncommon to provision UEs with native IPv4.

Tore