response case in-sensitivity?

[Hauke Lampe]

On 30.07.2015 03:02, Mathew Ian Eis wrote:

> My reading of that article suggests the RFC compliant behavior is to preserve the case in the response, is this correct? https://deepthought.isc.org/article/AA-01113/0/Case-Insensitive-Response-Compression-May-Cause-Problems-With-Mixed-Case-Data-and-Non-Conforming-Clients.html

I never quite understood DNS compression rules but I can confirm what
you see with BIND 9.10.2 and that the ACL mentioned in the comments
changes the behaviour.

The responses matches the case of the cached entry:

SRV? _xmpp-server._TCP.hauke-lampe.de. (61)
1/4/9 _xmpp-server._TCP.hauke-lampe.de. SRV jabber2

SRV? _xMpP-ServeR._tCp.haukE-lampE.de. (61)
1/4/9 _xmpp-server._TCP.hauke-lampe.de. SRV jabber2


with "no-case-compress { any; };":

SRV? _xmpp-server._TCP.hauke-lampe.de. (61)
1/4/9 _xmpp-server._TCP.hauke-lampe.de. SRV jabber2

SRV? _xMpP-ServeR._tCp.haukE-lampE.de. (61)
1/4/9 _xMpP-ServeR._tCp.haukE-lampE.de. SRV jabber2

["This new ACL is going to be available in 9.10.0 (noted already as
being in 9.10.0b1), 9.9.6, and 9.8.8, as well as in subscription
versions of BIND."]


Hauke.