> In the Calling-Station-Id i get the device IP Address and not the MAC!
How you want to retrieve a MAC if VPN client can be theoretically behind one or more routers and, at all, it can use non-Ethernet link to accessto the VPN server? If you want to get MAC - use PPPoE for clients, or make MAC fixation by scripts, or use something like ipguard... - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html