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

Mark Andrews <marka@isc.org> Tue, 27 July 2021 21:19 UTC

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From: Mark Andrews <marka@isc.org>
In-Reply-To: <20210727201504.2939B25365A4@ary.qy>
Date: Wed, 28 Jul 2021 07:19:09 +1000
Cc: dnsop@ietf.org, puneets@google.com
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To: John Levine <johnl@taugh.com>
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Subject: Re: [DNSOP] I-D Action: draft-ietf-dnsop-glue-is-not-optional-02.txt
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> On 28 Jul 2021, at 06:15, John Levine <johnl@taugh.com> wrote:
> 
> It appears that Puneet Sood  <puneets@google.com> said:
>> Couple of comments and a readability suggestion
>> 
>> * +1 to Geoff Huston's request to provide justification for why
>> sibling glue is desirable in a response. Also would prefer to not make
>> it mandatory in a referral response. ...
> 
> I would prefer we completely remove the sibling glue, or at most move
> it to an appendix of possbily useful minor improvements.
> 
> We say that authoritative servers MUST return all the glue, which is true
> for real glue, but not true for sibling glue (unless the sibling is in
> a loop which is not something to encourage.)  Let's not confuse people,
> please.

The MUST is an instruction to developers.  It is not a comment on whether
the record is actually required or not because there is a circular dependancy.

>> * Section 5: Promoted or orphan glue
>> The considerations for handling orphan glue will be different for a
>> TLD vs a lower level zone within a domain. I would think that orphan
>> glue in a TLD context should go away when a zone is deleted/expired.
>> Maybe even have sanity checking to prevent such an operation.
> 
> This is a political question, not a technical one. If the DNS operator
> has external knowledge that the orphan's domain has not been delegated
> to someone else, you can make a case to leave the glue. The usual
> example is a name in a TLD which has expired but is still in the grace period,
> but it can happen anywhere someone delegates names; I run registries
> at the third level like watkins-glen.ny.us.
> 
> I don't see how we can offer any more than general and vague advice here.
> 
> R's,
> John
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka@isc.org