Regarding entropy, that is correct. Regarding case, in any case (pardon
the pun) case is not guaranteed. Especially regarding dynamic updates,
your case will not be preserved (and maybe I fat-fingered and left caps
lock on once upon a time without realizing it) in the authoritative zone.
The mixed (within a label) case queries seem to be an artifact of entropy
preservation, but in cache e.g. isc.org matches ISC.ORG or isc.ORG, or
ISC.org... hopefully you get the idea.
I ran into a transient problem last summer with case sensitivity in SuSE
Leap, hasn't come back but my best guess is something to do with NSCD.
There is a tension between the protocol ("any octet") vs what you can
register ("valid hostnames") vs what's sent to the public DNS ("case
insensitive").
--
Fred Morris
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