I am trying to connect my iPad (running 4.3.3) with my Macbook (running Lion) in my college dorm room using my college's Wifi. It uses 802.1X Authentication. I can't ping my iPad from my Macbook. Is there any way I can make Bonjour or AirPlay work? Is there a tool that proxies or routes the Bonjour service somehow?
If all else fails you can create a wireless LAN directly on your Mac and connect your iPad to this WLAN. TUAW has some good instructions on how to do this. To start pick the appropriate option in the Airport/Wi-Fi menu (picture shamelessly taken from the linked TUAW article):
The rest is pretty self-explaining.
Nambrot: What David said is exactly right. The college network is also almost certainly not able to detect if you're using a router, and routers are probably only not permitted in dorms in the sense that they make you potentially vulnerable to network breaches, packet sniffing, or incorrect subnets. If your college network doesn't permit static, externally visible IP addresses, and also (naturally) doesn't work with Bonjour, I think you're out of luck. I'm basing this strictly off of my own IT experience working at my university though, so YMMV.