Because from the 15th to the 26th September the Google Ad system just stopped impressing all of our ads. Well not quite all - 1 or 2 snuck through, which was enough to make the percentage reports go nuts! Here's the plot of daily total delivered ads for the Netherlands across that last year or so.

Geoff

> On 10 Oct 2023, at 9:28 pm, Robert Kisteleki <robert@ripe.net> wrote:
>
> (It's a conjecture but) I find it plausible that Google does some network engineering in various regions, including the one serving NL, and selectively turning IPv6 on/off for stuff they serve.
>
> If what the Google stats is shown what percentage of traffic *to them* is on IPv6, then these changes may cause the stats to change. "Geoff's ads" are offered by Google but served by Geoff's infra, which is not Google's so it is unaffected.
>
> Robert
>
>
> On 2023-10-10 11:50, Eric Vyncke (evyncke) via ipv6-wg wrote:
>> A measurement issue at Google is probably where to look (or some peering/routing with Google AS)
>> -éric
>> *From: *ipv6-wg <ipv6-wg-bounces@ripe.net> on behalf of Mikael Abrahamsson via ipv6-wg <ipv6-wg@ripe.net>
>> *Date: *Tuesday, 10 October 2023 at 11:35
>> *To: *Marco Davids (Private) <mdavids@forfun.net>
>> *Cc: *RIPE IPv6 WG <ipv6-wg@ripe.net>
>> *Subject: *Re: [ipv6-wg] Why did the Google IPv6 statistics dropped for the Netherlands?
>> On Tue, 10 Oct 2023, Marco Davids (Private) via ipv6-wg wrote:
>>> Hello,
>>>
>>> Is there anyone in this group that would dare to speculate on the sudden drop in IPv6 adoption for my country, the Netherlands on this URL?
>> https://stats.labs.apnic.net/ipv6/NL <https://stats.labs.apnic.net/ipv6/NL> doesn't show equivalent drop.
>> Last I heard presentation about how APNIC measures this, it's through
>> Google ads served to web browsers, so that sounds like similar method to
>> what google might be using.
>> --
>> Mikael Abrahamsson    email: swmike@swm.pp.se
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