[Pdns-dev] Recursor iterating over AXFR queries

Alexander Gall gall at switch.ch
Wed May 19 10:51:31 CEST 2010

On Wed, 19 May 2010 08:52:16 +0200, bert hubert <bert.hubert at netherlabs.nl> said:

> On Tue, May 18, 2010 at 11:00:07AM +0200, Alexander Gall wrote:
>> It appears that the PowerDNS recursor treats AXFR queries received
>> over UDP with the RD flag set like any other query, i.e. it sends
>> iterative queries with qtype AXFR to authoritative servers of parent
>> zones of the qname.  Most likely, this affects all versions of the
>> recursor including 3.2.
> (...)
>> I'm not a PowerDNS user and only subscribed to the list to report this
>> issue.  I would be grateful if somebody could turn this into a proper
>> bug report.

> Thanks for this report - rumours of an AXFR problem had already reached us
> over IRC, but we could not trace these back to sufficient details to debug
> the issue.

> The issue has been verified, and has been addressed in
> http://wiki.powerdns.com/trac/changeset/1619 which will form part of the
> imminent 3.2.1 release of the PowerDNS Recursor.


> Many thanks for reporting this issue, and apologies that this bug caused
> weird queries to arrive at the .CH servers..

Just a drop in the ocean of weirdness :)


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