Google IPv6 measurements in Europe appear heading down...

Olivier MJ Crepin-Leblond ocl at
Thu Oct 23 19:58:17 CEST 2014

Dear Eric,

on the project we are also seeing rises &
falls depending on areas.
We have attributed this to several potential causes:

1. temporary allocation of IPv6 addresses & roll-back when faced with a
tech problem
2. a less inter-connected IPv6 network thus affected by changes in
peering agreements & BGP routing. (this has been quite a significant
3. changes in hosting for some large content providers - this sometimes
happens when content providers strike a deal with another hosting
company or merge

Kind regards,


On 23/10/2014 17:38, Eric Vyncke (evyncke) wrote:
> 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

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