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Re: [DNSOP] dnssec-kskroll-sentinel-06 clarifications

Mark Andrews <marka@isc.org> Tue, 20 March 2018 02:03 UTC

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From: Mark Andrews <marka@isc.org>
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Date: Tue, 20 Mar 2018 13:03:13 +1100
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References: <dfb0182f-fada-c1ea-93fc-4f8c29046725@nic.cz> <4f4fffb1-09ed-9155-5c5a-7a64fa2e5c60@nic.cz>
To: Vladimír Čunát <vladimir.cunat@nic.cz>
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Subject: Re: [DNSOP] dnssec-kskroll-sentinel-06 clarifications
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> On 20 Mar 2018, at 3:10 am, Vladimír Čunát <vladimir.cunat@nic.cz> wrote:
> 
> On 03/18/2018 09:44 PM, Petr Špaček wrote:
>> The current text in section 5 is written with an assumption that query
>> with +CD bit cannot result in "Secure" status and thus cannot trigger
>> sentinel processing, but this depends on implementation.
> 
> I just want to note that this situation of answering +cd queries by
> validated cached RRs isn't very implementation-specific.  One way to
> come to this: it seems generally desirable to have aggressive caching
> (rfc8198) on forwarders, due to serving as a cache shared by multiple
> resolvers, and validating resolvers tend to use +cd to query the
> forwarders (rfc4035#section-3.2.2).

You can’t assume whether CD will be 1 or 0 when the client is validating.
Both types of queries are useful.  The mentioned section just fails to
discuss the CD=0 case.

> --Vladimir
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka@isc.org

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