On Jul 9, 2015, at 9:02 PM, Matthew Kaufman 
<matt...@matthew.at<mailto:matt...@matthew.at>> wrote:
On Jul 9, 2015, at 4:07 PM, Owen DeLong 
<o...@delong.com<mailto:o...@delong.com>> wrote:
...
You are correct… In order for 20% of Google’s traffic to come from IPv6 
connected devices, there would generally need to be more than 20% of all 
devices connected over IPv6.

That doesn't follow at all.

One guy who has v6 and really loves youtube can account for most of it.

Matthew -

That would be the case if the measurements of “IPv6 users” were based on 
traffic or packet
counts, but Google’s measurements are based on specific pairs of HTTP 
connection attempts
(one IPv4, and one IPv6) and the ratio of those which are IPv6 capable.  The 
measurement
methodology is documented in the Google research paper -
<http://research.google.com/pubs/pub36240.html>

I’ll also observe that APNIC has been conducting its own research via a 
different approach
but achieved a rather similar measurement results for of IPv6 enabled users in 
the US -
<http://labs.apnic.net/dists/v6dcc.html>.   You can find more details on the 
approach used
here <http://www.circleid.com/posts/20120625_measuring_ipv6_country_by_country>

Both techniques indicate more than 20% of the US Internet users are connecting 
via IPv6.

FYI,
/John

John Curran
President and CEO
ARIN


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