Google IPv6 measurements in Europe appear heading down...

Kate Lance kate at
Thu Nov 6 04:23:31 CET 2014

Hi Éric,

I'm puzzled, not about the recent decline (and now near-recovery) but at the
odd 'kick' in the stats on Aug 17, mainly for Europe. 

Compare Belgium and most of the high-IPv6 EU countries (for clarity I left a
couple out like FR and CH, but they have small kicks as well):,de,lu,ro,cz,no

- with high-IPv6 non-EU (BE left in for comparison):,us,jp,pe,my
The US and Peru show small increments too, but certainly not like the EU countries.

Looking closely, it appears something increased the measurements in Europe a
little on 13 Aug, then a lot on 17 Aug.  Erik Taraldsen from Telenor Norway
said they'd been rolling out v6 since summer - but that sounds more gradual
than a sudden increment in mid-August. Any ideas ...?


On Thu, Oct 23, 2014 at 06:03:42PM +0000, Eric Vyncke (evyncke) wrote:
>    With the link, it is probably better… still need some caffein
>    [1],
>    de,us,lu
>    From: Eric Vyncke <[2]evyncke at>
>    Date: jeudi 23 octobre 2014 09:38
>    To: "[3]ipv6-ops at" <[4]ipv6-ops at>
>    Subject: Google IPv6 measurements in Europe appear heading down...
>    For a couple of weeks, it seems that Google IPv6 measurements are
>    heading down mainly for Europe. For example, here is a link to a
>    presentation of the Google measurements for several European countries
>    and USA. There is a clear drop in the last days/weeks for European
>    countries but not for USA.
>    This includes a big drop for my country (BE) :-O and I have checked
>    with all Belgian ISP and they have no explanation as for them 'business
>    as usual'. Apnic also does not show such a big drop.
>    So, I am guessing either a 'bug' in Google measurements infrastructure
>    in Europe or could it be that the IPv6 latency to Google has increased
>    a lot so that Happy Eyeball prefers IPv4? Recent measurement of
>    dual-stack latency to from several Belgian ISP gave 10%
>    slower over IPv6.
>    Any clue will be welcome
>    -éric
> References
>    1.,de,us,lu
>    2. mailto:evyncke at
>    3. mailto:ipv6-ops at
>    4. mailto:ipv6-ops at

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