Re: [dnsext] WGLC: RFC6195bis IANA guidance

[Donald Eastlake <[e-mail]>]

Hi Dick,

On Thu, Jul 5, 2012 at 6:06 PM, Dick Franks <[e-mail]> wrote:
> Donald,
>
> My apologies for late response.
>
>
> On 22 June 2012 19:10, Donald Eastlake <[e-mail]> wrote:
> ...
>>> [3.1 paragraph 4]
>>> and [3.2 paragraph 4]
>>>
>>> Regexes:
>>>
>>>                         [A-Z][A-Z0-9\-]*[A-Z0-9]
>>>
>>>                        (TYPE|CLASS)(0|[1-9][0-9]*)
>>>
>>> could be simplified to:
>>>
>>>                         [A-Z][A-Z0-9]*
>>>
>>>                        (TYPE|CLASS)[0-9]*
>>
>> That's not simplification, that's change.
> A simplification of the underlying production rule for RRTYPE mnemonics,
> which inevitably flows through to the regex.

OK, it is a simplification of the RegEx, but one I don't agree with.

>> I believe that internal hyphens should be allowed within RRTYPE and
>> CLASS mnemonics. We do not know what future mnemonics or sets of
>> mnemonics will be required. Better to remain more flexible here.
>
> There appears to be no real-world requirement to do so. The justification for
> flexibility would best be debated if/when some genuine need arises.
>
> The collective decision of a multitude of worthy authors, over a span of more
> than 25 years, has been to treat RRTYPE mnemonics as simple Algol/Fortran
> style identifiers, even when some clearly had the opportunity to do otherwise.
>
> The regex should be tightened to make explicit a de facto standard observed
> by prominent members of the IETF engineering community.

We appear to disagree and no one else has spoken on this. If this were
a brand new draft/standard, I'm not sure how this would be settled.
However, it is not. IANA Considerations for DNS has explicitly
permitted hyphens in these mnemonics since 2008 (and were silent on
this point before that) and a mnemonic with a hyphen was allocated
earlier and remains in the registry today. Under these circumstances,
I believe the RegEx should not be changed to prohibit hyphens.

> The unmodified regex has the unintended and undesirable consequence that
> it allows the IANA tail to wag the IETF dog.

I don't understand that at all. The applicant normally selects the
mnemonic and, if the applicant doesn't, then the Expert does. IANA
does not.

Thanks,
Donald
=============================
 Donald E. Eastlake 3rd   [phone] (cell)
 155 Beaver Street, Milford, MA 01757 USA
 [e-mail]

>> I have no problem with making the Regex 2 exclusion slightly stronger
>> so going with your changed Regex 2 is fine with me.
> +
>
>
> --Dick
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