Dear Eric, on the http://www.ipv6matrix.org 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 challenge) 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, Olivier 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 www.google.com from several Belgian ISP gave 10% > slower over IPv6. > > Any clue will be welcome > > -éric