Hello,

Is it possible with free RADIUS to form tunnel directly between two radius servers which dont have any shared secret between them but knowing each other IP address. Means by forming the secret dynamically with TLS handshaking?

no, but there are some dedicated tools that form TLS tunnels and then transport TCP and UDP packets through that tunnel. I've heard of zebedee http://www.winton.org.uk/zebedee/ for example, it does explicitly state that it does UDP tunneling. Note, however, that this does not automatically do the RADIUS secret handshaking for you, you have got to do that yourself. If you want to give it a try, I'd be interested in hearing from your experiences. Greetings, Stefan Winter -- Stefan WINTER Fondation RESTENA - Réseau Téléinformatique de l'Education Nationale et de la Recherche Ingénieur de recherche 6, rue Richard Coudenhove-Kalergi L-1359 Luxembourg email: stefan.winter@restena.lu     tél.:    +352 424409-1 http://www.restena.lu               fax:      +352 422473