Connected to 2001:1890:e000:c01:dad3:85ff:feda:1004.
Escape character is '^]'.
0WORLD OF WARCRAFT CONNECTION - SERVER TO CLIENT^]
But after authentication, I get dumped to realm list. Selecting Uther shows the "Logging in to game server" pane, then dumps back to realm list. Cancelling shows my character list on Uther (shrug?!) and lets me begin logging in, but at around 95% loaded, the client freezes.
Not a lot of useful debug info, I'm afraid; like I said, looks like a transient network weird in AT&T, but their strange internal routing and ICMP filtering makes it pretty hard to be sure. I do get into AT&T's v6 network before things go wonky, though.