Peap/MSCHAPV2 wifi: Connected but no IP
 

Hi,
i know many posts discuss wifi connection with Peap/MSCHAPV2, but i'm not sure if i have the same problem as others. Actually, instead of using wpa_supplicant (i tried it but got some errors about driver not supported), i've used the wifi network manager. After putting all needed infos, the n800 told me that "I'm connected".
I tried iwconfig, and i see that i'm connected to the needed AP. I tried ipconfig, but i see localhost IP address (127.0.0.1) and i can browse nothing. It's like i'm not connected even if i didn't get any failure in the connection procedure.
So, is there a way to solve this problem? did others get the same problem (connected but no ip)?
Thanks.