On Sat Sep 19 15:24:27 2009, Matthew Wild wrote:
According to RFC 2782, SRV record targets are *not* allowed to be
"alias" records, this includes CNAMEs and PTRs for example. I just
made a change (not yet checked in) to Prosody which
(unintentionally)
would render domains configured in such a way unreachable. I
restarted
my server with the new code for testing to find a handful of my
contacts can no longer accessible.
Wikipedia has a very good primer on CNAME (and DNAME, its scarier
cousin).
I'd particularly refer you to
http://mengwong.com/misc/rfc1912-is-wrong.html though, which refers
to RFC 974:
"
Of course, by the robustness
principle, domain software should not fail when presented with
CNAME
chains or loops; CNAME chains should be followed and CNAME loops
signalled as an error.
"
So I'd say that settles your question of what the default should be.
:-)
Dave.
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