Hola Sergio, We are long time users/customers of Radiator and i can only say that we are more than happy with it. I don't know exactly the numbers about maximum performance but in our former company (one of the biggest ISPs in Europe) we also used Radiator for authentication and accounting of dial-up and xdsl access for million of customers. For Radiator there are some tricks like using two different Radiators; one for authentication and a different one for accounting, use the self-included round-robin function, etc, etc. I never used Free Radius and one of the main reasons was that i never needed to look for a different Radius server other than Radiator... and the support from Open guys is exceptional!. Regards. Saludos JesusR. ------------------------------------ Jesus Rodriguez VozTelecom Sistemas, S.L. jesusr(a)voztele.com http://www.voztele.com Tel. 902360305 -------------------------------------