For anyone interested in playing with IPv6 I recommend Vultr their routing seems to work instantly, where other providers seem to have some churn. On Linode for example once I start actually using more than ~100 IPv6 endpoints it starts forgetting the previous ones for a few minute at a time. Vultr does proper prefix routing it seems.
Discussion here
https://digitalocean.uservoice.com/forums/136585-digitalocea...