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[atlas] [request] AD bit in DNS query

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Maciej Andziński Maciej.Andzinski at nask.pl
Tue Dec 15 11:52:36 CET 2015

Hi,

Apropos of the discussion about arbitrary QTYPE in DNS measurement, I would like to make a request for another small improvement. It would be nice if a probe had the ability to send a DNS query with AD bit set. Such query would be useful in some cases (for instance when using "Use the Probe's Resolver(s)" feature) and would reduce data volume.


According to RFC6840 section 5.7:

5.7.  Setting the AD Bit on Queries

   The semantics of the Authentic Data (AD) bit in the query were
   previously undefined.  Section 4.6 of [RFC4035] instructed resolvers
   to always clear the AD bit when composing queries.

   This document defines setting the AD bit in a query as a signal
   indicating that the requester understands and is interested in the
   value of the AD bit in the response.  This allows a requester to
   indicate that it understands the AD bit without also requesting
   DNSSEC data via the DO bit.


Many greetings,
Maciej Andziński,
NASK

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