Lookup for reserved LDH labels

Simon Josefsson simon at josefsson.org
Thu Nov 8 10:24:26 CET 2012


Andrew Sullivan <ajs at anvilwalrusden.com> writes:

> On Wed, Nov 07, 2012 at 05:57:06PM +0100, Marcos Sanz wrote:
>> 
>> Andrew,
>> 
>> > What about instead, in 5.1,
>> > the following:
>> >
>> >     If the string is an NR-LDH label, it proceeds directly to DNS Name
>> >     Resolution (see Section 5.6).
>> 
>> though I find the text redundant, I am all for it if it helps as a
>> clarification for implementors.
>
> Note that this addition _would not_ solve the problem of an existing
> record of the form ab--cdef.  Those are still restricted LDH labels,
> and aren't allowed.

What is an "restricted LDH label"?  I can't find the definition of that
term in RFC 5890/5891.

/Simon


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