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

[Mark Andrews]

In message <9fc47420fb263da9eda170166fd4db07 at cornell.edu>, John Wobus writes:
> 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.

	You will need BIND 9.4.0 or later for the master.

1811.   [func]          Preserve the case of domain names in rdata during
                        zone transfers. [RT #13547]

	Or you can specify many-answers as the transfer format
	on the master.

> The problem was that the compression mechanism would compress
> a.example.COM and b.example.com 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
> b.example.COM.
> 
> 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. foo.bar.com on the master became foo.bar.COM 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=A0 from the environment.
> >
> > -- =
> 
> > -Ben Croswell
> > _______________________________________________
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org