Re: [DNSOP] [Ext] Re: draft-ietf-dnsop-extended-error and combinations of EDEs and RCODEs

Viktor Dukhovni <ietf-dane@dukhovni.org> Thu, 12 September 2019 18:10 UTC

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From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Subject: Re: [DNSOP] [Ext] Re: draft-ietf-dnsop-extended-error and combinations of EDEs and RCODEs
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> On Sep 12, 2019, at 12:42 PM, Vittorio Bertola <vittorio.bertola@open-xchange.com>; wrote:
> 
> But isn't the foremost motivation of this document to allow the client to tell between SERVFAIL due to DNSSEC validation failure and SERVFAIL due to resolver issues, and try another resolver in the latter case but not in the former?

That's the crux of the matter and, in short, *no*, that's not (or should
not be) the motivation.

SERVFAIL means,  and will continue to mean, I can't help you, better luck next
time (or elsewhere).

The new EDEs are *diagnostic* detail to aid in troubleshoots, but do not
override RCODEs.  They are not a more fine-grained RCODE one might "act on".
If we want more fine-grained *actionable* codes, there's plenty of room for
more values in the 12-bit EDNS RCODE.

[ I chatted off-list with Wes, the above appears to match his take, with a bit
  luck also rough WG consensus... ]

-- 
	Viktor.