Re: [DNSOP] Empty Non-Terminal sentinel for Black Lies

Shumon Huque <shuque@gmail.com> Wed, 28 July 2021 11:48 UTC

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From: Shumon Huque <shuque@gmail.com>
Date: Wed, 28 Jul 2021 07:47:59 -0400
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To: Ralf Weber <dns@fl1ger.de>
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Subject: Re: [DNSOP] Empty Non-Terminal sentinel for Black Lies
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On Wed, Jul 28, 2021 at 7:42 AM Ralf Weber <dns@fl1ger.de> wrote:

> Moin!
>
> On 28 Jul 2021, at 1:34, Shumon Huque wrote:
>
> >    The Black Lies method of providing compact DNSSEC denial of existence
> >    proofs has some operational implications.  Depending on the specific
> >    implementation, it may provide no way to reliably distinguish Empty
> >    Non-Terminal names from names that actually do not exist.  This draft
> >    describes the use of a synthetic DNS resource record type to act as
> >    an explicit signal for Empty Non-Terminal names and which is conveyed
> >    in an NSEC type bitmap.
> Hmm I may be sleep deprived, but the way I read this is that instead of
> giving back NoError/NoData and a standard NSEC responses I now have to
> give back an additional record type, so that some client can distinguish
> that
> as not being NXDomain, which according to the answer it never was?
>
> Does this mean we would have to change all existing authoritative server
> to add this record type to signal an empty non terminal responses?
>

Hi Ralph,

No. This is only for Black Lies implementations (which lie about NXDOMAIN).
If you don't do Black Lies, you don't have to do anything.

Shumon.