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

Joe Abley <jabley@hopcount.ca> Wed, 06 March 2019 16:41 UTC

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From: Joe Abley <jabley@hopcount.ca>
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Date: Wed, 06 Mar 2019 11:41:28 -0500
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References: <155094804613.28045.8648150477440044197@ietfa.amsl.com> <CA+9_gVscCzr0S8A0Z23q0V1B+BZeLtDoZRSKyEJDPZ3P=KT-tw@mail.gmail.com> <CAL9jLaYo5JH6vf+djEn0O=YGhLV2AkytMg_eKQmWn=Pma5yBFQ@mail.gmail.com> <4253851.Zqd2zPpPcC@linux-9daj> <92355508-D5AC-46DC-8FF5-C1C4155601D8@isc.org> <alpine.LRH.2.21.1903042240330.32161@bofh.nohats.ca> <23678.40176.492174.37630@gro.dd.org> <3E7AF476-0989-4FA8-8186-F5AAFC87317A@icann.org> <alpine.LRH.2.21.1903051202360.1124@bofh.nohats.ca> <23679.9798.678631.923122@gro.dd.org> <alpine.DEB.2.20.1903061237440.17454@grey.csi.cam.ac.uk> <3BCC02A3-9F05-4A35-A06E-D69719EB7CB5@hopcount.ca> <23679.62694.104026.271181@gro.dd.org>
To: 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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On 6 Mar 2019, at 11:27, Dave Lawrence <tale@dd.org> wrote:

> Joe Abley writes:
>> if you can find a set of DNS authority servers that silently
>> discards a particular kind of query, sending such queries through
>> resolvers that are known to support serve-stale might suppress other
>> queries and trigger the serve-stale behaviour even though the
>> authority servers are not actually unresponsive for them.
> 
> RFC 2308 section 7.2 made it clear that when caching a dead server
> indication, "The indication MUST be stored against query tuple <query
> name, type, class, server IP address> unless there was a transport
> layer indication that the server does not exist, in which case it
> applies to all queries to that specific IP address."

Ahh, I forgot about that text in 2308! Good, then.


Joe

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