Airport connected to LAN delivers internet but not networked printers

My high school has ethernet ports in the wall. If I plug my iBook straight into the wall ethernet with a cable, I can get a list of networked printers all over the school and print to them, and also get internet. If I plug my new Airport Express into the same ethernet outlet, I can get the internet from my iBook, but no printer lists. Requests to print on printers I have already used successfully via direct cable to wall ethernet return "Printer Not Found." Why should my iBook to Airport Express to LAN connection offer less than my iBook to LAN connection? I'm tired of carrying my computer to the wall every time I want to print!
iBook   Mac OS X (10.4.5)  
iBook   Mac OS X (10.4.5)  

Out of the box, the AX is set up as a router, which blocks access to your ethernet network (and is causing problems all along the network). You need to disable the DHCP function on the AX (use the AirPort Admin Utility) which will turn it into a wireless access point. You should create a New Profile in the AX so you can switch between the "normal" finction and the access point mode.

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