Re: [DNSOP] Call for Adoption: draft-pwouters-powerbind

Joe Abley <jabley@hopcount.ca> Fri, 01 May 2020 18:32 UTC

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From: Joe Abley <jabley@hopcount.ca>
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Date: Fri, 1 May 2020 14:32:19 -0400
In-Reply-To: <alpine.OSX.2.22.407.2005011422400.33172@ary.qy>
Cc: Bob Harold <rharolde@umich.edu>, IETF DNSOP WG <dnsop@ietf.org>
To: John R Levine <johnl@taugh.com>
References: <yblr1w438fb.fsf@w7.hardakers.net> <20200501014428.427E818950D7@ary.qy> <CA+nkc8B44xPK=QxRsOsPtY1V0NT7Bji7Cf2AiPp2SH29oG6gNw@mail.gmail.com> <alpine.OSX.2.22.407.2005011422400.33172@ary.qy>
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Subject: Re: [DNSOP] Call for Adoption: draft-pwouters-powerbind
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Hi John,

On 1 May 2020, at 14:23, John R Levine <johnl@taugh.com> wrote:

>> On Thu, Apr 30, 2020 at 9:44 PM John Levine <johnl@taugh.com> wrote:
>>> I think it's benign to allow any sort of record as an immediate child
>>> of the domain, since you need to go two levels down for split zones.
>>> That handes the nominet and zz--zz cases.
> 
>> Is there any chance that a user trying to reach https://example.com could
>> get the orphan glue A record for example.com instead of the A record in the
>> real zone?
>> (Just trying to think of cases where orphan glue might make a difference.)
> 
> Only if the zone had NS and A at the same name, which would be pretty broken.

Oh, interesting.

In a sense, a glue record with the same owner name as a zone cut could be equivalent to a glue record with an owner name that is subordinate to a zone cut. I don't have enough of the spec in my head to know why they would definitively be different from the protocol perspective. I realise it's not normal, but I don't know that it's prohibited.

I definitely don't know operationally how different DNS or registrar software implementations treat that case. I don't think the registry systems I'm familiar with allow host and domain objects with the same name to coexist, but I realise I could quite well be wrong.

If I had any more energy to spend at the keyboard today I might be tempted to find out :-)


Joe