Is there any way to connect an Airport Express base station to a wired network requiring authentication? I'm using the university network which requires a user name and a password and bought an AE to set up a private wifi network for my mac, ipod touch and printer, without considering this. I've tried a few things but haven't found anything useful. I guess sharing the connection via my mac's Airport would be possible, but how do I set up the AE to extend the mac's wireless network while it's connected to it? It can't be done from an ipod touch, can it?