Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-serve-stale-03.txt

Tony Finch <dot@dotat.at> Wed, 06 March 2019 15:11 UTC

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Date: Wed, 6 Mar 2019 15:11:18 +0000
From: Tony Finch <dot@dotat.at>
To: Joe Abley <jabley@hopcount.ca>
cc: dnsop <dnsop@ietf.org>, Dave Lawrence <tale@dd.org>
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Subject: Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-serve-stale-03.txt
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Joe Abley <jabley@hopcount.ca> wrote:
>
> How recently should a server have been checked and found not to respond
> to conclude that it's unresponsive? What does unresponsive mean?
> Presumably this involves a timeout; how long? Perhaps these questions
> are already answered in practice by existing implementations, but I
> don't know that they are written down anywhere.

I think it's covered in the draft already.

> If a server responds to some queries but not others (e.g. same QNAME,
> different QTYPEs) is that unresponsive across the board? Or does
> responsiveness depend on the precise (QNAME, QCLASS, QTYPE) tuple?

Best response to this kind of brokenness is to tell them to fix it, not
to work around it.

https://tools.ietf.org/html/draft-ietf-dnsop-no-response-issue

Tony.
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