Re: the ipv4 vs ipv6 growth debate

[Mark Andrews <marka () isc org>]

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 <beecher () 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 <jmamodio () 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 <beecher () 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 <nanog () 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.taht () gmail com <mailto:dave.taht () 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