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Re: [dnsext] [Technical Errata Reported] RFC4034 (2681)

Chris Thompson <cet1@cam.ac.uk> Fri, 25 March 2011 19:43 UTC

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Date: Fri, 25 Mar 2011 19:45:11 +0000
From: Chris Thompson <cet1@cam.ac.uk>
To: Paul Hoffman <paul.hoffman@vpnc.org>
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References: <20110105221815.A7E0FE0701@rfc-editor.org> <4D8AB330.5090504@ogud.com> <7306D60F-AE42-466F-AED9-51C58E32299E@vpnc.org>
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Cc: sra@isc.org, gubailey@microsoft.com, dnsext@ietf.org, jari.arkko@piuha.net, rdroms.ietf@gmail.com, RFC Errata System <rfc-editor@rfc-editor.org>, roy.arends@telin.nl, Olafur Gudmundsson <ogud@ogud.com>, massey@cs.colostate.edu
Subject: Re: [dnsext] [Technical Errata Reported] RFC4034 (2681)
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On Mar 25 2011, Paul Hoffman wrote:

>On Mar 24, 2011, at 3:57 AM, Olafur Gudmundsson wrote:
>
>> This errata is also correct,
>> I ran into this same issue myself.
>
>I am not an implementer, so I am not sure that what I say here is correct.
>It sounds like the normative text in Appendix B does not match the presumably
>normative "reference implementation" in C a few paragraphs later. If so, why
>does the "reference implementation" win over the C code?

Because it is what everyone has actually implemented? And it's not really
clear which is more "normative", given text like

* It is not necessary to use the following reference code verbatim, but
* the numerical value of the Key Tag MUST be identical to what the reference
* implementation would generate for the same input.

It's bad enough that the tag calculation is a botched version of the
ones-complement checksum in the first place, without trying to change
it at this stage.

-- 
Chris Thompson               University of Cambridge Computing Service,
Email: cet1@ucs.cam.ac.uk    New Museums Site, Cambridge CB2 3QH,
Phone: +44 1223 334715       United Kingdom.

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