A cluster of freeradius servers

Hi, I want to deploy the next configuration: I have a proxy radius server (freeradius) who redirect its requests to another freeradius server. I have another freeradius server with the same configuration as this last one. What I want is to configure the proxy radius to proxy requests to one of these servers. It this fail, then it should ask to the other one. If this posible with freeradius? How do I do it? -- Angel L. Mateo Martínez Sección de Telemática Área de Tecnologías de la Información _o) y las Comunicaciones Aplicadas (ATICA) / \\ http://www.um.es/atica _(___V Tfo: 968367590 Fax: 968398337