Torfinn Ingolfsen wrote:
[ ... ]
If I try it with ping in a shell (on FreeBSD), it also fails.
However both 'host' and 'nslookup' happily foes a lookup of that name.
so it seems that our resolver (on FreeBSD) is to blame.
I have seen a few old (ok, from 2003) mailing list posts, which seems to
indicate that the official rules says that 'underscores are not allowed
in hostnames'. Is this still the case?
Yes, underscores are not valid characters for hostnames, per RFC 822 and
others. The underscore was not permitted because it is easily confusable with
a hyphen or minus sign, BTW.
If so, why is FreeBSD in rwo minds about it (nslookup and host working,
resolver not)?
nslookup, dig, and so forth perform DNS queries directly, bypassing the system
resolver (and flat files like /etc/hosts), and do not perform sanity checking
of the results because these tools are intended for debugging DNS problems.
--
-Chuck
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