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Re: [DNSOP] Alissa Cooper's No Objection on draft-ietf-dnsop-negative-trust-anchors-10: (with COMMENT)

Evan Hunt <each@isc.org> Thu, 09 July 2015 15:56 UTC

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Date: Thu, 09 Jul 2015 15:56:04 +0000
From: Evan Hunt <each@isc.org>
To: Olafur Gudmundsson <olafur@cloudflare.com>
Message-ID: <20150709155604.GA89001@isc.org>
References: <20150708225400.20543.78092.idtracker@ietfa.amsl.com> <CAHw9_iJ9LPDhhdDby4QW6K354P7rEuxOjTbAVdSmd2td7AAJnw@mail.gmail.com> <20150709031114.GA78479@isc.org> <16533673-B804-4F47-9427-3D2701E66344@gmail.com> <CAN6NTqwSqg0Y3_fPuM9Xs3OQ9gi2QuJUaBWXjGuRmbs01_M-Rw@mail.gmail.com>
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Cc: Tim Wicinski <tjw.ietf@gmail.com>, draft-ietf-dnsop-negative-trust-anchors.ad@ietf.org, "dnsop-chairs@ietf.org" <dnsop-chairs@ietf.org>, dnsop <dnsop@ietf.org>, Alissa Cooper <alissa@cooperw.in>, Suzanne Woolf <suzworldwide@gmail.com>, The IESG <iesg@ietf.org>, draft-ietf-dnsop-negative-trust-anchors.shepherd@ietf.org, draft-ietf-dnsop-negative-trust-anchors@ietf.org
Subject: Re: [DNSOP] Alissa Cooper's No Objection on draft-ietf-dnsop-negative-trust-anchors-10: (with COMMENT)
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On Thu, Jul 09, 2015 at 11:29:11AM -0400, Olafur Gudmundsson wrote:
> Strictly speaking the minimum time needed for a Negative Trust anchor is
> something like
> Domain_Operator_reaction_time + Parent_reaction_time + Parent DS TTL +
> DNSKEY TTL

Valid point. When the NTA for a name expires, the cached data at and below
that name can also be discarded, so TTLs aren't a major concern when the
cache and the validator are coresident, and it hasn't been a factor with
BIND.  But if validating forwarders and stubs support NTAs they may have
a different experience.

-- 
Evan Hunt -- each@isc.org
Internet Systems Consortium, Inc.

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