Re: [DNSOP] Consensus check on underscore names and draft-ietf-dnsop-rfc7816bis

Viktor Dukhovni <ietf-dane@dukhovni.org> Tue, 13 July 2021 17:01 UTC

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From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Date: Tue, 13 Jul 2021 13:01:08 -0400
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Subject: Re: [DNSOP] Consensus check on underscore names and draft-ietf-dnsop-rfc7816bis
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> On 13 Jul 2021, at 6:22 am, Petr Špaček <pspacek@isc.org> wrote:
> 
> As Viktor pointed out in https://mailarchive.ietf.org/arch/msg/dnsop/w7JBD4czpGKr46v-DlycGbOv9zs/ , it seems that this problem plagues roughly tens out of 150k domains he surveyed. I think this makes further discussion about _necessity_ of the workaround kind of moot.

Full disclosure, I only tested TLSA records.  I can't speak to what
one might expect with SRV or other record types.  Yes, failures are
not that common, for what is worth another example:

	https://dnsviz.net/d/_tcp.mail.ncsc.de/YO3DpQ/dnssec/
	https://dnsviz.net/d/_25._tcp.mail.ncsc.de/YO3Bsw/dnssec/

Here the "A" query for the ENT was unexpectedly "REFUSED". :-(

If implementations at least seriously consider the advice to treat
special-use labels *specially*, I'll declare victory...

-- 
	Viktor.