radius + peap + wifi + mac os x

Hi, I'm using freeradius (+mysql) in a wireless infrastructure with a dozen of linksys WAP54G access point (using AES). Authentication is PEAP with mschapv2. All go right when use Windows clients but no response using Mac Os X clients. Any ideas? Someone says me that MacOsX use a tunnel with md5 nor mschapv2. Note that is server starts with -X no authentication is required from MacOsX client. thanks in advance v.