[throwaway47292]

offtopic: ipv6 is fine, but the ipv6 internet is just broken

few days ago I had ipv6 enabled on my pi4 and was trying to update it, turns out that the ipv6 address of archive.raspberrypi.org was returning 404 (its fixed now)

but it took me like 3 seconds to just net.ipv6.conf.all.disable_ipv6 = 1, and i am not gonna enable it until something on ipv4 does not work

(and by ipv6 i mean native ipv6 from my ISP)

it has been like that for the last 15 years, since we gave native ipv6 to our users in my ISP, people just had worse experience than not having it.

[markonen]

Right. Dual stack IPv4 + IPv6 is strictly worse for reliability than plain IPv4 because both stacks need to work perfectly or you'll encounter issues. In that sense it provides the opposite of redundancy.

Happy Eyeballs (RFC 8305) is the typically touted solution, but even that doesn't help in the scenario you describe: IPv6 connectivity wasn't broken.

The problem is simply that we now have twice as many things that can go wrong and no plausible route away from dual stack in sight.