Greetings ! I have the following situation here that I'd like to ask for some assistance with, if possible: My client has a RADIUS server installed (running freeRADIUS 2.0.5), and routers working as hotspots that users can connect to. Users can authorize against the RADIUS server using a name/password combination, which is stored in a MySQL database (using the rlm_sql module and the Cleartext-Password attribute in the radcheck table). This part works correctly. Now, my client wants an extra check to be added which would allow each user to login only from a specific MAC address, which can be different for each user, and which is obtained when the user logs in for the first time. Checking the MAC address is easy, as the hotspot is sending the MAC address in the Calling-Station-Id attribute that I could easily store in the radcheck table as well - but the problem is that this MAC address is not known when the name/password pair is being added to the radcheck table, and I am to make it so that when the user is successfully authorized for the first time, there is no MAC check, but the user's current MAC address is remembered on the server, and further logins are only permitted from that MAC address. So, I am thinking that the best solution would be to have the RADIUS server add a new "(username), 'Calling-Station-Id', '=', (user's MAC)" entry to the radcheck table, right after a successful SQL auth step, if such an entry isn't yet in the table. And my question is - is there a way to accomplish this with existing FreeRADIUS modules, or do I need to implement my own module to do this ? Thank you ! / Tomas