I have installed 7 Access Points 1121G on my school. The AP are covering the space of 8 classrooms and there is some leaking of signal to the outdoors.
When I installed the system everything worked great (with my wireless laptop - Broadcom 54g MaxPerformance builtin card ). I was able to roam from one classroom to the last one without ever losing connection to my network
Problems are starting to show with some student's laptops, they claim that some days they have connection OK, but somedays not. I went there, tested everything again, and did not find a problem (using my laptop).
Because I am in the pilot phase, I dont' even have security on the WAN, Access Points are Open, no encryption. My only protection is that the Wireless Lan belongs to a VLAN that goes directly to the internet, it does not touch my internal LAN. Later I will increase security to avoid abuse of the service of course.
At first my recommendation to student who asked was to get Wi-Fi Certified NIC, but it seems that it does not matter....yesterday I was unable to make a MN-720 (microsoft) to get IP from my DHCP, signal strenght was great though. I used a fixed IP, and then I was able to ping externals hosts without problem...I could not solve the problem, because for some reason the DNS queries did not work...but that could be something extra.
I need some advises. Thanks a lot!!!