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Re: [DNSOP] NXDOMAINs as in RFC 1034

Shumon Huque <shuque@gmail.com> Tue, 29 May 2018 10:18 UTC

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From: Shumon Huque <shuque@gmail.com>
Date: Tue, 29 May 2018 06:19:43 -0400
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Subject: Re: [DNSOP] NXDOMAINs as in RFC 1034
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On Tue, May 29, 2018 at 1:45 AM Mukund Sivaraman <muks@mukund.org> wrote:

>
> RFC 1034 states in 3.1 "The domain system makes no distinctions between
> the uses of the interior nodes and leaves, and this memo uses the term
> "node" to refer to both."
>

Right.


> Then, it states in 3.6 "A domain name identifies a node.  Each node has
> a set of resource information, which may be empty."
>

Ah, great. I couldn't remember whether 1034 described this explicitly.
Thanks
for quoting the relevant sentences. My point was that 1034 did not use the
term "Empty Non Terminal", although as you point out here, it clearly
describes
the concept (an interior node with no resource information, and that this
node
exists).


> I agree clarification is good, and so RFC 8020++.. however note the
> point Vixie makes - NXDOMAINs for ENTs have never been correct in the
> DNS. RFC 8020 clarifies it, but the implementations which return
> NXDOMAINs are broken against RFC 1034 onwards.
>

Yes, agreed completely.

Shumon.

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