Call for INN 2.5.2 testing (new NNTP RFC 3977)
rra at stanford.edu
Sat Nov 28 10:47:13 UTC 2009
Julien ÉLIE <julien at trigofacile.com> writes (quoting another message):
> Actually, the trailing dot is meaningful. A domain without a trailing
> dot is a relative domain; for example, if you are within the
> "example.com" domain, then "foo" could resolve to "foo.example.com" (or
> if that doesn't exist, then it would try resolving that at the root
> level, and fail since "foo" is not a TLD). A domain with a trailing dot
> is an absolute domain; it will only ever be resolved at the root level.
This is a widely implemented feature of the UNIX DNS resolver library
which I suspect has been copied nearly everywhere, but if I recall
correctly, this isn't standardized anywhere. I think that this behavior
happens entirely inside the client resolver and doesn't appear on the
network in any standard protocol, so it doesn't show up in IETF standards.
Russ Allbery (rra at stanford.edu) <http://www.eyrie.org/~eagle/>
Please send questions to the list rather than mailing me directly.
<http://www.eyrie.org/~eagle/faqs/questions.html> explains why.
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