Issue with case changing from master on BIND 9 to slave on BIND 8

John Wobus jw354 at
Mon Dec 15 18:17:14 UTC 2008

Some years ago, I had that issue.  The problem was that the
zone transfer compression mechanism could change the case
of individual names.  This was fixed in some release of bind
(after 9.2.1, if I remember correctly), and bind release notes
would pinpoint the exact version with the change.

The problem was that the compression mechanism would compress
a.example.COM and by using a pointer to a single string,
in one specific instance, "example.COM".  When uncompressed
at at the secondary end, the names came out as a.example.COM and

John Wobus
Cornell University CIT

On Dec 15, 2008, at 10:51 AM, Ben Croswell wrote:

> I reaching out to the list on what appears to be a very odd issue that 
> happened over the weekend.
> We had an issue where some internal domains had the TLD capitalized 
> after the zone transfer.
> i.e. on the master became on the slave.
>  I know that DNS is case insensitive but it caused an issue with apps 
> that were misbehaving.
> The master is BIND 9.2.1 and the slaves in question are 8.2.3.
> The master zone has everything lower case, and BIND 9 slaves show them 
> as lower case as well.
>  A manual zone xfer on the 8.2.3 boxes to a different local directory 
> than the actual named directory shows .COM.
> I was wondering if anyone had experienced an issue like this.
> And I understand both of those version are ancient and need to be 
> removed  from the environment.
> -- 
> -Ben Croswell
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