Is Free still doing 6to4 (which was probably fine at the time) or did they start doing native ipv6?
Free was doing 6rd, which is similar to 6to4 but not quite the same.
Re:IAB Statement on IPv6
by quicksilver03 on Tuesday November 08, 2016 @01:50PM
(#12902867)
I'm on Free and I had to disable IPv6 because one of their routers was dropping about 60% of the IPv6 packets: GitHub, Google, Bitbucket took several minutes to load.
As soon as I switched to IPv4 everything worked fine.
I suppose that nobody at Free is really monitoring their IPv6 network in the same way they do it for IPv4.
Let's not get started on "pro" versions where you just don't get IPv6 at all, ever, and on the phone you can even get them mumbling that it's not even on the table (Completel).