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Re: [DNSOP] Glue is not optional, but sometimes it *is* sufficient...

Lanlan Pan <abbypan@gmail.com> Mon, 25 May 2020 16:34 UTC

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From: Lanlan Pan <abbypan@gmail.com>
Date: Tue, 26 May 2020 00:34:01 +0800
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To: Shumon Huque <shuque@gmail.com>
Cc: Joe Abley <jabley@hopcount.ca>, dnsop <dnsop@ietf.org>
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Subject: Re: [DNSOP] Glue is not optional, but sometimes it *is* sufficient...
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Shumon Huque <shuque@gmail.com> 于2020年5月22日周五 下午11:00写道：

> On Fri, May 22, 2020 at 10:52 AM Joe Abley <jabley@hopcount.ca> wrote:
>
>> On 21 May 2020, at 16:07, Warren Kumari <warren@kumari.net> wrote:
>>
>> > What does all of this *mean*?
>> > ..
>> > ..
>> > ..
>> > Sorry, I haven't a clue, other than maybe:
>> > The DNS is weird.
>>
>> In your experiment it seems clear that all the glue records you are
>> looking for are being returned from the involved authority-only servers in
>> the additional section, and since for the COM zone that's a
>> well-constrained monoculture of software it seems reasonable to imagine
>> that's not where to look.
>>
>
> Indeed. Since the COM referral response to glue queries is correct, this
> means that some resolvers the Atlas probes are using are promoting glue to
> answers.
>
> Has anyone surveyed which of the following category of things are
> promoting glue to answer: (1) other TLD authoritative services, (2)
> authoritative server software implementations, (3) "public" (contentious
> term I know) resolvers, and (4) resolver software implementations?
>
some resolvers send the NS_DOMAIN A query to glue ns ip, get the response
from authority,  and overwrite the glue.
the TTL of the authority response  is shorter than the glue.

>
> That would be an interesting but possibly very time consuming project -
> but we could focus on the major ones.
>
> Shumon.
>
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