Re: [dnsext] [Technical Errata Reported] RFC4343 (6361)

Donald Eastlake <d3e3e3@gmail.com> Wed, 23 December 2020 04:15 UTC

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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Tue, 22 Dec 2020 23:14:48 -0500
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To: RFC Errata System <rfc-editor@rfc-editor.org>
Cc: Eastlake III Donald-LDE008 <Donald.Eastlake@motorola.com>, Erik Kline <ek.ietf@gmail.com>, "Eric Vyncke (evyncke)" <evyncke@cisco.com>, Olafur Gudmundsson <ogud@ogud.com>, Andrew Sullivan <ajs@anvilwalrusden.com>, me@kasparetter.com, IETF DNSEXT WG <dnsext@ietf.org>
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Subject: Re: [dnsext] [Technical Errata Reported] RFC4343 (6361)
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Hi,

I am the author of RFC 4343. See below.

On Tue, Dec 22, 2020 at 6:29 AM RFC Errata System
<rfc-editor@rfc-editor.org> wrote:
> The following errata report has been submitted for RFC4343,
> "Domain Name System (DNS) Case Insensitivity Clarification".
>
> --------------------------------------
> You may review the report below and at:
> https://www.rfc-editor.org/errata/eid6361
>
> --------------------------------------
> Type: Technical
> Reported by: Kaspar Etter <me@kasparetter.com>
>
> Section: 4.1
>
> Original Text
> -------------
> No "case conversion" or "case folding" is done during such output
> operations, thus "preserving" case.
>
> Corrected Text
> --------------
> ?
>
> Notes
> -----

> Whose case is preserved? The case of the label in the DNS query or
> the case of the label in the DNS database?

The earlier text in Section 4.1 is intended to indicate it is the
"database".

> In other words, if there is a DNS record for ietf.org and I query
> IETF.org, should the DNS response say ietf.org or IETF.org? I would
> expect it's the former so that the DNS administrator can inform the
> DNS requester about the preferred capitalization but I can't figure
> this out on the basis of the RFC.

Well, you seem to have figured out how it works, although I have no
idea what why the reference to "DNS administrator" rather than DNS
resolver or DNS server.

> Does output case preservation refer to something else? All I observe
> is that tools like dig return the latter when I run 'dig IETF.org'.

Right. The deployed DNS generally conforms to this RFC.

> Maybe an errata is not the right place to ask for clarification but
> given the name of the RFC, I would expect to find a clear answer to
> this question in the RFC.

Well, I have no problem with the theory that any successor document to
this RFC should be clearer on this point.

> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party
> can log in to change the status and edit the report, if necessary.

I'm not sure about the details of "errata" status but I think this
should end up in the "hold for future documentation" or whatever the
usual formula is. The RFC isn't wrong but is arguably unclear for some
readers.

Thanks,
Donald
=============================
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 2386 Panoramic Circle, Apopka, FL 33896 USA
 d3e3e3@gmail.com

> --------------------------------------
> RFC4343 (draft-ietf-dnsext-insensitive-06)
> --------------------------------------
> Title               : Domain Name System (DNS) Case Insensitivity Clarification
> Publication Date    : January 2006
> Author(s)           : D. Eastlake 3rd
> Category            : PROPOSED STANDARD
> Source              : DNS Extensions
> Area                : Internet
> Stream              : IETF
> Verifying Party     : IESG