On 25 Jan 2018, at 7:36, Warren Kumari wrote:
On Thu, Jan 25, 2018 at 10:10 AM, Tony Finch <d...@dotat.at> wrote:
Isn't this going to cause problems with software that checks hostname
syntax?
Yes. However, that software will only be on the authoritative server
side, yes? If you're a researcher who wants to run a sentinel test, you
can use authoritative server software that doesn't block that. For
example, I'm pretty sure Geoff's software either does not block that or
could be tweaked easily to not block.
Wouldn't it be better to use something like a double hyphen to avoid
collisions?
Possibly, or using CNAMES. I (personally) liked the underscores as it
separated this from the rest of the namespace, but the double hyphen
also sounds like an interesting idea.
What does the WG think?
Sentinel would be the first example of label-based special cases in
resolver software. The special-case labels can be anything that would
not ordinarily appear at the left. Using
dcyen28c5wxcf95fcsxceexwwe1z-ta-12345.example.com works just as well,
and would probably cause fewer implementers to make bad assumptions
about the future. Underscores are already used for preventing those
assumptions, but any unused string works.
--Paul Hoffman
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