Radius-DHCP and users

[gluca]

Hello!
I installed Zentyal on a small LAN, should handle about 40 users who authenticate via access point with WPA2 Enterprise and get the ip via dhcp. I configured Zentyal with Radius. But now I have a problem: how can I go back to the users?

In the log of radius I can see:
- Ip access point where it was accessed
- Ok Login / incorrect
- User Name
and
- Not receiving a mac address

Dhcp log in:
- Mac address
- Ip assigned

If a user saturates the available bandwidth, it is impossible to go back to him.
Thank you.

ps: sorry for my english