Unable to get AAAA for www.revk.uk from some of our servers

Frank Bulk frnkblk at iname.com
Wed Dec 24 17:08:24 UTC 2014


Except queries from 96.31.0.5 and 199.120.69.24 reliably return the AAAA
while queries from 96.31.0.20 do not.  And we're all the same ISP, and in
the one case, from the same /24.  I don't think Google is that granular. And
we do have good IPv6 connectivity.

Regards,

Frank Bulk

-----Original Message-----
From: Stuart Henderson [mailto:stu at spacehopper.org] 
Sent: Wednesday, December 24, 2014 11:05 AM
To: Frank Bulk
Cc: 'Mark Andrews'; bind-users at isc.org
Subject: Re: Unable to get AAAA for www.revk.uk from some of our servers

On 2014/12/23 21:33, Frank Bulk wrote:
> So the question seems to come down to: "why does Google's name server not
> return the AAAA when I query it from some IPs?"

Didn't google have some kind of ISP whitelisting for handing out AAAAs?

Ah yes... https://developers.google.com/speed/public-dns/faq mentions it:

"Note that you may not receive IPv6 results for Google properties. To
optimize the user experience, Google only serves AAAA records to clients
behind ISPs with good IPv6 connectivity."





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