If you really want to know if a site works over IPv6 you have to flush any 
cached pages and turn off IPv4. You also need to be using a IPv6 only 
nameserver. Only after doing those extra steps can you say a site is IPv6 
ready. I’ve had pages that appeared to be all IPv6 fail after doing these extra 
steps. 

As for connection racing IPv6 wins 99.99% of the time. There is enough bias 
that it will win unless there is a lossy path involved. 
-- 
Mark Andrews

> On 6 Dec 2022, at 06:02, Tom Beecher <beec...@beecher.cc> wrote:
> 
> 
> But IPv6Foo , ast least as far as I could tell by quickly looking at the 
> code, cannot tell you if an IPv6 connection WOULD have worked, but IPv4 is 
> where it ended up. 
> 
> With Happy Eyeballs, if the IPv4 TCP session finishes up only a couple ms 
> faster than the IPv6 ones, the v4 one wins out. That doesn't give you any 
> meaningful signal as to WHY it landed on IPv4 instead. 
> 
>> On Mon, Dec 5, 2022 at 12:32 PM Jorge Amodio <jmamo...@gmail.com> wrote:
>> 
>> With IPv6Foo you can click on the icon and it will show you a table listing 
>> what URLs are serving some piece of a given page with v6 and v4.
>> 
>> LinkedIn for example shows the main feed page served via v6 but there are a 
>> couple of pieces with v4 from these sites
>> 
>> - dpm.demdex.net
>> - lnkd.demdex.net
>> - p.adsymptotic.com
>> - radar.cedexis.com
>> - sb.scorecardresearch.com
>> - trkn.us
>> 
>> Some may be feeding ads content, others tracking, market research, etc.
>> 
>> Regards
>> Jorge
>> 
>>> On Mon, Dec 5, 2022 at 11:09 AM Tom Beecher <beec...@beecher.cc> wrote:
>>> Often lost in the 'debate' about V6 adoption is that for a 100% native IPv6 
>>> experience to work, there are multiple other components that have nothing 
>>> to do with the network that ALSO have to work correctly. Any issues with 
>>> these are likely going to cause fallback to v4. 
>>> 
>>> It's very difficult to know how much v4 traffic to a website COULD have 
>>> worked just fine on v6, but didn't, and why it didn't. 
>>> 
>>>> On Sat, Dec 3, 2022 at 7:16 PM Matt Corallo <na...@as397444.net> wrote:
>>>> It would be nice if IPvFoo showed the bytes and connection/request count. 
>>>> It's going to be a 
>>>> loonnggg time before we can do consumer internet browsing with no v4, 
>>>> until then it's about reducing 
>>>> cost of CGNAT with reduced packets/connections.
>>>> 
>>>> For twitter, the main site is v4, yea, but abs.twimg.net (Edgecast) and 
>>>> pbs.twimg.net (Fastly) make 
>>>> up the vast majority of the bytes fetched on the site for me and are both 
>>>> v6 now. I don't recall 
>>>> when I last checked but they were still v4-only not too long ago.
>>>> 
>>>> The other end of it is v6-only servers that don't accept inbound 
>>>> connections. Thos have been 
>>>> hampered IME by github not serving git over v6. Supposedly it's coming 
>>>> soon but so much modern 
>>>> software fetches stuff from Github that that's a major blocker.
>>>> 
>>>> Matt
>>>> 
>>>> On 11/27/22 7:44 PM, Jorge Amodio wrote:
>>>> > 
>>>> > I use the same extension on Chrome.
>>>> > 
>>>> > I'm surprised that with all the recent hoopla about it, from the major 
>>>> > social media platforms, 
>>>> > Twitter still shows serving their http site over IPv4, Facebook and 
>>>> > LinkedIn show solid IPv6.
>>>> > 
>>>> > -J
>>>> > 
>>>> > 
>>>> > On Sun, Nov 27, 2022 at 9:29 PM Dave Taht <dave.t...@gmail.com 
>>>> > <mailto:dave.t...@gmail.com>> wrote:
>>>> > 
>>>> >     I use a web plugin tool called ipvfoo to track my actual ipv4 vis 
>>>> > ipv6
>>>> >     usage. I wish it worked over time. With very few exceptions I am 
>>>> > still
>>>> >     regularly calling ipv4 addresses in most webpages. Has anyone done a
>>>> >     more organized study of say, the top 1 million, and how many still
>>>> >     require at least some ipv4 to exist, and those trends over time?
>>>> > 
>>>> >     -- 
>>>> >     This song goes out to all the folk that thought Stadia would work:
>>>> >     
>>>> > https://www.linkedin.com/posts/dtaht_the-mushroom-song-activity-6981366665607352320-FXtz
>>>> >     
>>>> > <https://www.linkedin.com/posts/dtaht_the-mushroom-song-activity-6981366665607352320-FXtz>
>>>> >     Dave Täht CEO, TekLibre, LLC
>>>> > 

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