response case in-sensitivity?
barmar at alum.mit.edu
Thu Jul 30 14:46:50 UTC 2015
In article <mailman.2375.1438232213.26362.bind-users at lists.isc.org>,
Mark Andrews <marka at isc.org> wrote:
> In message <23DEE83F-7476-432B-92B9-F8D34D617C2F at nau.edu>, Mathew Ian Eis
> > Howdy BIND,
> > Weve been troubleshooting an issue with iOS print discovery using DNS-SD
> > for the last several weeks. We made a little bit of a breakthrough this
> > evening when we observed in a packet trace that the response case was
> > fully lowercase, regardless of the query case. It seems iOS is doing some
> > kind of case sensitive comparison between the query and the response,
> > causing DNS-SD to fail when they dont match.
> Then iOS (or the application) is broken. Domain names should always
> be compared case insensitively. Please report a bug to the app
> vendor and / or Apple.
Isn't this the DNS 0x20 security enhancement? Clients send a random mix
of case, and check that the response matches, to protect against spoofed
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