The youtube folks made the decision to leave the video-serving hostnames available in blacklist-mode, meaning only very broken networks won't get AAAAs. This is being watched, and could easily change back. The exact policy for blacklisting has yet to be fully formalized. But re: 6to4 in this case, it still gains you nothing you didn't already have while risking randomly crappy performance. _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf