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Re: [DNSOP] Caching of negative zone (non-authoritative) responses

Shane Kerr <shane@time-travellers.org> Tue, 09 July 2019 08:46 UTC

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From: Shane Kerr <shane@time-travellers.org>
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Date: Tue, 09 Jul 2019 10:46:06 +0200
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Subject: Re: [DNSOP] Caching of negative zone (non-authoritative) responses
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Paul,

Minor nit, just to be pedantic.

On 08/07/2019 20.38, Paul Vixie wrote:
> REFUSED means, in my reading (and coding) that there is no zone declaration at
> the authority. SERVFAIL means the zone is declared/configured, but not loaded.
> i now realize that both have to have a holddown timer, not just SERVFAIL.

ServFail means "something bad happened". There are 10 possible reasons 
listed in the extended errors draft:

https://datatracker.ietf.org/doc/draft-ietf-dnsop-extended-error/

And there are of course many, many more. So it _could_ be zone is 
declared/configured, but not loaded, but not necessarily.

This doesn't change your perfectly correct observation that a hold-down 
timer is needed for both Refused and ServFail.

Cheers,

--
Shane

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