[dns-operations] Odd query pattern

[Florian Weimer]

* 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
records:

<http://www.ietf.org/mail-archive/web/dnsext/current/msg10640.html>

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/
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