[dns-operations] open resolver versio.bind responses

[Peter van Dijk]

Hello Vernon,

On Apr 16, 2013, at 17:58 , Vernon Schryver wrote:

>> From: Jared Mauch <jared at puck.nether.net>
> 
>> Check out the breakdown.html page  ...
> 
>    2013-04-14 results
> 
>    34030764 servers responded to our udp/53 probe
>    914175 servers responded from a different IP than probed
>    27773382 gave the 'correct' answer to my A? for the DNS name queried.
>    13721271 responded from a source port other than udp/53
>    29571967 responses had recursion-available bit set.
>    2827206 returned REFUSED
> 
> What was heard from the 3.4 million servers that responded with neither
> the A RR nor REFUSED? 

Some auths (like PowerDNS, depending on send-root-referral setting) respond with an empty non-aa non-ra NOERROR to indicate "don't have authoritative data for you".

Kind regards,
-- 
Peter van Dijk
Netherlabs Computer Consulting BV - http://www.netherlabs.nl/