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, 6 Mar 2019 11:41:28 -0500
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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