Re: [IPv6] Second Working Group Last Call for <draft-ietf-6man-rfc6724-update>

[David Farmer <[e-mail]>]

On Thu, Apr 11, 2024 at 8:29 AM Ted Lemon <[e-mail]> wrote:

> On Thu, Apr 11, 2024 at 8:51 AM Kyle Rose <[e-mail]> wrote:
>
>> On Thu, Apr 11, 2024 at 8:41 AM Ted Lemon <[e-mail]> wrote:
>>
>>> But this is counterfactual. Rght now if you publish a ULA in the global
>>> DNS, it will not cause a delay because no host with IPv6 connectivity will
>>> try to connect to it. We only run into a problem if we decide to prefer all
>>> ULAs over all IPv4 addresses. That /will/ in fact cause delays.
>>>
>>
>> Because something is misconfigured. Right now, that misconfiguration is
>> hidden, and becomes visible only when IPv4 connectivity is broken for
>> whatever reason. Fix the glitch, which is the ULA in global DNS.
>>
>
> Kyle, I don't know if you can see this from where you're sitting, but you
> are making a religious argument here. It is not a misconfiguration to put a
> ULA in the DNS right now in the sense that it causes a problem. It's a
> misconfiguration because it doesn't match your mental model of How Things
> Should Be.
>
> I don't entirely disagree with you about this—I don't think that we ought
> to put ULAs in the global DNS. But I don't actually have a solid argument
> against Lorenzo's position—I just don't happen to agree with it.
>

I disagree with both of you. The distinction between local and global DNS
only exists in the human mind. It doesn't exist in the DNS protocol or on
the wire, except for the relatively recent availability of the .local
zone.  And even with .local, there is no way to distinguish between
different instances of .local. You don't know if a .local query is for or
if the response is from your instance or my instance of .local. Except for
the .local zone, there is no way to know if a query is intended to be
global or local or if a response is global or local. The protocol on the
wire is identical, and any distinction is a fiction of the human mind.

Furthermore, ULAs are global in scope, and if implemented correctly, they
are effectively unique globally. The only real question is whether they are
reachable or not, and preferring known-local ULAs and not other ULAs speaks
directly to the reachability question. Whether or not the ULAs belong in
the DNS or not, and how the DNS is configured, is irrelevant. The real
question is only if they are reachable or not, and again, known-local ULAs
resolve this question.

Thanks



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