check-names settings
Barry Margolin
barmar at alum.mit.edu
Sat Sep 13 02:34:27 UTC 2008
In article <gaeumj$gfv$1 at sf1.isc.org>,
Mark Andrews <Mark_Andrews at isc.org> wrote:
> Labels start with a letter or digit. Labels end with a
> letter or digit. Letter, digit or hypen in the middle of
> the label.
>
> All labels meet the above with the exception of a mbox where
> second to last labels meet the above.
>
> A single period can also be used as a place marker.
>
> The rules are applied to the owner names of A, AAAA and
> MX records.
> NS and MX records rdata.
> IN-ADDR.ARPA and IP6.ARPA PTR records rdata.
> (I don't think I've missed any cases).
>
> Underscore was choosen for SRV records so that they would
> *not* clash with hostnames.
Even folks who put underscores in hostnames are practically never going
to clash with SRV records. Labels in SRV records *start* with
underscores, and no one does that with hostnames, even if their
nameservers allow it. Underscores, like hyphens in standard-conforming
hostnames, are always used as word separators in hostnames.
--
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE don't copy me on replies, I'll read them in the group ***
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