There’s a demonic force at work in Diablo III greater than anything we’ve faced before: lag. Right now there’s a ”major lag” issue affecting the Diablo III servers and Blizzard are calling on gamers for help.
They’d like your traceroute data, as well as your ISP and geographical location. They’ve given out a specific IP for us to use so we can send in our feedback to help the Blizzard engineers.
They’ve got a handy traceroute tool called Looking-Glass available on the Battle.net website. Specifically they’d also like for users to send end their traceroute data for the IP 12.129.209.68.
Check out this Battle.net forum thread for more.