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Re: NAT64 in RA, draft-ietf-6man-ra-pref64

Lorenzo Colitti <lorenzo@google.com> Tue, 02 July 2019 10:53 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Tue, 02 Jul 2019 19:53:26 +0900
Message-ID: <CAKD1Yr2mzeVzXFmzh3N21MCr-sg1xJ9D67TPqvEd9YffCrzdqA@mail.gmail.com>
Subject: Re: NAT64 in RA, draft-ietf-6man-ra-pref64
To: Jen Linkova <furry13@gmail.com>
Cc: Fred Baker <fredbaker.ietf@gmail.com>, 6man <6man@ietf.org>
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On Tue, Jul 2, 2019 at 9:49 AM Jen Linkova <furry13@gmail.com> wrote:

> > The question boils down to - imagine I had only IPv6 to work with. Could
> we communicate? An IPv6-only host, or IPv6-only network, could communicate
> with that restriction. Everything else is noise - and if I have to deal
> with noise, it's not IPv6-only.
>
> I totally agree. it was my understanding of IPv6-only as well.
> So - back to the original problem of excluding some addresses from
> DNS64 synthesis/NAT64 translation - I've been told that an IPv6-only
> host might want to exclude some addresses from synthesis and use IPv4
> to reach them, so I'm trying to understand how *an IPv6-only* host
> (which, IMHO, can only use IPv6) reach anything using IPv4.
>

Right. That was the gist of my earlier comment. I believe we all agree that
in the most common deployment scenario (i.e., an IPv6-only host with no
IPv4), an exclusion list is not useful, because the host really can't reach
anything that's not reachable via IPv6.

If so, then I really think that an exclusion list should be a separate
option.

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