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

Fred Baker <fredbaker.ietf@gmail.com> Tue, 02 July 2019 00:29 UTC

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From: Fred Baker <fredbaker.ietf@gmail.com>
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Subject: Re: NAT64 in RA, draft-ietf-6man-ra-pref64
Date: Mon, 01 Jul 2019 17:29:18 -0700
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To: Jen Linkova <furry13@gmail.com>
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On Jun 30, 2019, at 8:06 PM, Jen Linkova <furry13@gmail.com> wrote:
> First I think we need to clarify what  'IPv6-only' means.

To my mind, that is mostly complex because people make it complex, or because we allow them to.

Imagine I have two hosts, each of which can only communicate using IPv6. They only have IPv6 addresses, and they possibly only have IPv6 stacks, but they don't have anything else. If they can communicate in a domain, from their perspective it is a domain that will support end to end IPv6 communication. If they have to do something in addition, the domain doesn't work for IPv6-only hosts.

Now, it could be that the communications are translated to IPv4, X.25, or SNA in between. Yup, could happen. But we can communicate end to end using only IPv6, right?

And, oh yes, someone using IPv4 (or X.25, or SNA) could go through a translator and communicate with an IPv6-only host in such a domain. It's IPv6-only up to that translator.

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.
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