Wireless works in Bridge mode but refuses in Share a Public IP

This might seem like the easiest problem, but after searching the forum for ages I am still clueless.
I connect to the internet by plugging the ethernet cable straight into the wall. Living in a student flat connecting through the uni's network. MAC-address is not required to log on. In order to access the internet however, username and password is required at a greeting/log on page.
Things were working fine with multiple laptops and streaming iTunes, having the AE setup to share a public ip, until yesterday when iTunes could no longer find the AE. After resetting the AE (plug out, plug in) internet could no longer be accessed. The log on page can't be found, it just times out.
I've been trying a few different setups and the only one that works is using the AE in bridge mode. I want to have it set up to share a public IP but nothing seems to work. Although the router gets an IP assigned and so does the laptop (the AE seems to communicate with the uni network, and the laptop communicates with the AE) internet can't be accessed by the laptop.
Any ideas? If I missed providing some vital info please let me know!
Thanks!

Welcome to the discussions!
I've been trying a few different setups and the only one that works is using the AE in bridge mode. I want to have it set up to share a public IP but nothing seems to work. Although the router gets an IP assigned and so does the laptop (the AE seems to communicate with the uni network, and the laptop communicates with the AE) internet can't be accessed by the laptop.
From your information, the main router at the school's network has been configured to only accept a certain type of connection. Bridge mode is the correct setting for the AirPort Express in this type of setup because you have another router (the school's router) ahead of your device.
Unless you can convince the IT guys there at the school to modify things to allow you to connect using "share a public IP address", I'm afraid there is nothing more than can be done.
In more technical terms, the school's router will not allow another device to handle DHCP on the network.
Message was edited by: Bob Timmons

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