One more thing to troubleshoot at 3 am, one more thing to teach to a disinterested tier 1 support team, one more thing for Chrome to be weird about, hundreds more rules to manage in a hostile load balancer, logging tools that don't understand ipv6.
Turned it off. End customer asked why the site got a little slower (CGN) and when we can turn ipv6 back on. As far as I know it's still on the backlog.
Things have definitely gotten better over time, though. The massive 90s style corporate networks will probably never transition, but smaller and more modern companies don't have that issue.
Apple mandating that apps are IPv6 compatible and various government legislation forcing companies to make their shitty middleware IPv6-compatible has improved things quite a bit so far. As uptake keeps rising, the need for technologies like STUN and TURN will slowly start decreasing, and as a result more and more people will end up in "untested" situations where not having IPv6 and falling back to legacy paths starts becoming a problem.
I've been setting up Snapcast (open-source multi-room audio), and needed to move the server to a different machine. While I was setting up the new system, I told it to only bind to localhost. Somehow this only affects the ipv4 networking stack, as some of my clients started automatically connecting to the new server even before I had finished all my testing.
Turns out that it was advertising some kind of ipv6 link-local address that showed up in autodiscovery. In my case there wasn't any harm, but this type of thing could very easily result in a major security vulnerability.
I'm sure it's totally my fault but that's the point: folks who know how ipv4 works may have huge blind spots for ipv6.
* https://engineering.fb.com/2017/01/17/production-engineering...
* https://www.internetsociety.org/blog/2014/09/facebook-launch...
IPv4 is actually the "leftover" stuff they have to deal with at the front end.
But they are an eye-balls heavy service, with a lot of mobile devices, which also tend to be IPv6-native.
"No". Not every human is psychologically prepared to do that. They want to acquiesce, to go along to get along, you need somebody to be firm. "No".
I have also found that an uncomfortable number of people do not consider it appropriate in any way shape or form. Even when it’s ultimately your call and no one else’s.
Folks don’t really like waves. They like looking at them from the shore, but freak out when it’s their turn to hang 10
