Radius proxy - kind of

Hi everyone! First a little bit of explaining... - auth_server 1 client - fr_proxy -[ - auth_server 2 (client=random NAS, fr_proxy=freeradius, auth_server=two-factor auth server(s)) Currently we have clients authenticating directly to auth_server 1. We would like to gradually (and transparently) move users to new authenticators which use auth_server 2 Question What I would like to accomplish is: If auth_server 1 returns notfound or reject or fail, proxy request to auth_server 2 Is it possible to use 'configurable module fail over'-like syntax for configuring proxy (home)servers? I hopes this makes sense. Anyway... all ideas appreciated! Regards, Matija