[dns-operations] Odd query pattern

Florian Weimer fweimer at bfk.de
Mon Feb 21 11:00:35 UTC 2011

* Florian Weimer:

> Most such query sequences begin with a query which receives a negative
> response (and not a delegation, which rules out a measure to add
> randomness to the query).  My initial suspicion was that this is
> caused by misinterpreted RRSIG or NSEC3 records, but there is some
> data that appears to contradict this hypothesis---most zones receiving
> such queries are signed, but not all of them.

This could be a workaround for a protocol issue involving missing glue


But this doesn't explain the repeated queries with questions
increasing in length, so it's pretty broken even for a workaround.

Florian Weimer                <fweimer at bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99

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