Re: [DNSOP] comments on draft-bortzmeyer-dnsop-nxdomain-cut-00

神明達哉 <jinmei@wide.ad.jp> Mon, 30 November 2015 19:25 UTC

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References: <CAJE_bqe98gi0FHAhiug7w9HCrat_m4LpByqDuy=7m9afGiroug@mail.gmail.com> <20151122135234.GA1475@laperouse.bortzmeyer.org> <CAJE_bqcZnzAd0iuvfTvberU9LxEfeEHhZhDdpJQQpNb7qaQfdg@mail.gmail.com> <CAHPuVdVB2LBfrYMOzZdPPxk6MdQE-ZLq4+M-XcyRrR3_8b2PKg@mail.gmail.com> <20151129141628.GA8193@sources.org>
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To: Stephane Bortzmeyer <bortzmeyer@nic.fr>
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Subject: Re: [DNSOP] comments on draft-bortzmeyer-dnsop-nxdomain-cut-00
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At Sun, 29 Nov 2015 15:16:28 +0100,
Stephane Bortzmeyer <bortzmeyer@nic.fr> wrote:

> > > That was exactly my point, and in that sense I'd say "SHOULD
> > > delete" is redundant (and possibly imposes unnecessary
> > > restrictions on implementations).
> >
> > Yes, I agree. The current description is a bit too implementation specific.
>
> My concern is that some implementations may have a cache composed of a
> tree structure *plus* a hashed index for speed. When receiving a
> query whose answer is in the cache, such implementation may not
> perform a "downward search" in the cache.
>
> May be something like: "After the reception of a NXDOMAIN answer for a
> given name, the resolver SHOULD/MUST? reply NXDOMAIN for every name
> under the denied name." (There are details, such as TTL and such as
> RFC 6604, see the draft for these.)
>
> That way, we just specify a behaviour, with zero implementation
> detail.

Yes, this will address my point perfectly.

--
JINMEI, Tatuya