Hi Leen and Michael,

On Fri, 20 May 2016 09:31:31 +0200
Leen Besselink <[email protected]> wrote:
> I forgot to mention, when you query a recursor, the recursor can also 
> indicate that the response is DNSSEC-validated, you need to look at the 
> AD-bit.

For completeness, the recursor follows RFC 6840[1] ยง5.7 pretty strict (in a 
DNSSEC mode). This means that a +AD bit in the query will trigger validation in 
process mode. When the AD bit is not set in the query, the recursor will not 
answer with the AD bit set, even when the data is validated (in validation 
mode).

The DO bit in the query is interpreted as 'give me DNSSEC records', this means 
that the recursor will return NSEC(3) and RRSIG records in the response. But if 
there is no AD bit set, no validation will take place.

Best regards,

Pieter

1 - https://tools.ietf.org/html/rfc6840

-- 
Pieter Lexis
PowerDNS.COM BV -- https://www.powerdns.com
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