Peculiar DNS queries

[Fred Morris]

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