IPv6 has reached Clazzes.org and we are now running in dual stack mode, offering services over IPv4 and the "new" IPv6!
Two days ago our housing provider offered us to participate in the "friendly user phase" for there ongoing IPv6 introduction.
Technically this means:
IPv6 is not that new and there are regions and internet access providers without IPv4 addresses.
Therefore the majority of applications has good dual stack support now: When a server has IPv4 and IPv6 addresses, connections over both channels are attempted, either concurrently (faster one wins) or one after the other. This should allow pretty much all applications to connect to the server, even if the IPv6 setup or connectivity is broken somehow.
If an application fails to connect nevertheless, or if the attempt-both-approach just costs too much time, it is usually possible to tweak the application behaviour. For some details, feel free to read our according KnowHow arcticle on HowTo invite applications to prefer IPv4 or IPv6.
To provide feedback on Clazzes.org's IPv6 setup, please write to email@example.com or tweet @ClazzesOrg.