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Re: [DNSOP] NXDOMAIN and RFC 8020

"Murray S. Kucherawy" <superuser@gmail.com> Tue, 06 April 2021 22:39 UTC

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From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Tue, 06 Apr 2021 15:39:31 -0700
Message-ID: <CAL0qLwbY22_oH163Ob+DKcojDzmb+ytKUQKr_Z2_9+5x7_dwuA@mail.gmail.com>
To: John Levine <johnl@taugh.com>
Cc: "dnsop@ietf.org WG" <dnsop@ietf.org>
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Subject: Re: [DNSOP] NXDOMAIN and RFC 8020
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On Tue, Apr 6, 2021 at 2:41 PM John Levine <johnl@taugh.com> wrote:

> In this application, no, because it's not doing a strict tree walk:
>
> _dmarc.newjersey.sales.bigcorp.wtf
> _dmarc.sales.bigcorp.wtf
> _dmarc.bigcorp.wtf
>
> The _dmarc tag means that none of the names is an ancestor of any of
> the others. It could also look at, e.g., sales.bigcorp.wtf and see if
> it has an NXDOMAIN and prune names below that, but I don't think that
> approach is likely to win overall.


Sure, but if I query "_dmarc.newjersey.sales.bigcorp.wtf" and I get back an
NXDOMAIN for "sales.bigcorp.wtf", I can eliminate at least one query,
because I know right away that the second one in your list isn't there
either.  Extend that out to a name with a dozen or more labels in it and
you're getting somewhere.

-MSK

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