The academic version is free. Unfortunately OPNET is Windows only.

OPNET and Wireshark make for some very informative lab work.

URL to some labwork used by various universities:

http://faculty.kfupm.edu.sa/coe/ashraf/RichFilesTeaching/COE081_540/BPG_OPNET/BrownLabManauls

(I'm not sure where these labs came from, I think from a book. My networks lecturer used them as lab work for a 2nd/3rd year network course)

Not a WOW player, would WOW be playable on a ipad using this service? WOW players are used to subscription services, whats a extra $14.95 a month if you can play WOW in the bath.