DNS Cache Snooping?

Chris Thompson cet1 at hermes.cam.ac.uk
Wed Jun 25 16:45:18 UTC 2008

On Jun 25 2008, Paul Vixie wrote:

>> Now it is no way to put 9.4 into RHEL5 because it could break
>> existing configurations.
>we've been upgrading in place from 9.3 to 9.4, and recommending our bind
>support customers and the overall community to do the same, for a year or
>two with no bad reports.  9.4 is intended to be fully backward-compatible
>with 9.3.  if you know of some way in which it's not, please sing out.

Is this some strange meaning of the phrase "fully backward-compatible"
of which I was previously unaware?

Most obviously allow-recursion defaults to "localnets;localhost;" in 9.4
instead of "any;" in 9.3. That's exactly the sort of thing that "could
break existing configurations", big time.

The change has an entirely rational motivation, and it's pretty well
documented, but you really can't claim that it isn't an incompatibility.

Chris Thompson
Email: cet1 at cam.ac.uk

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