Re: DNS resolver and mixed case responses

Dale,

Am 03.04.2018 um 16:17 schrieb Dale Smith:
> I'm trying to understand what system is at fault here; the DNS server for
> not responding with the same case as the query, or HAProxy which should be
> performing a case insensitive match.

This is left unspecified in the standards, but on the other hand there
is this Internet Draft:
https://tools.ietf.org/html/draft-vixie-dnsext-dns0x20-00 which wants to
mandate case preserval to make DNS spoofing harder by introducing more
entropy in the DNS request.

I recommend to fix your internal DNS server, because case preserving
behaviour seems to be somewhat expected according to a quick Google search.

Best regards
Tim Düsterhus