Re: [DNSOP] I-D Action: draft-ietf-dnsop-glue-is-not-optional-02.txt

John R Levine <johnl@taugh.com> Wed, 28 July 2021 00:47 UTC

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Date: 27 Jul 2021 20:47:23 -0400
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From: "John R Levine" <johnl@taugh.com>
To: "Shumon Huque" <shuque@gmail.com>
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Subject: Re: [DNSOP] I-D Action: draft-ietf-dnsop-glue-is-not-optional-02.txt
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>>> Just to make sure we're talking about the same thing, the definition of
>>> sibling glue is glue from another zone delegated from the same parent.
>>
>> That's not what the example in 4.1 of the draft shows.  It has foo.test
>> depending on ns1.bar.test, so the server adds the A record for
>> ns1.bar.test.
>
> It does actually.

Oh, sorry, I misread your message.

> "ns1.bar.test/A" is glue for "bar.test" (and sibling glue for "foo.test" in that
> example). It is returned by the servers for "test" in a referral for "foo.test".
>
> Open to suggestions for more clarifying language.

Unless I'm misunderstanding something, in the absence of sibling glue, the 
resolver would make a second request for ns1.bar.test, same as if it were 
ns1.bar.otherdomain, and it would get back a referral with the glue.  It 
is just a performance tweak and I don't see why we should describe it as 
more than that.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly