Remote Radius Authentication Help

i have attached a picture to explain my question and hoping someone can share how can this be done? anyone?
remote.jpg

I have done such configuration for few mini ISP’s and WISP’s. Its very simple. Either add PPTP Server on your main Mikrotik, OR Install a central PPtP server in NOC where your RM is also located, Connect all your remote Mikrotik’s to the central PPtP server with PPtP connections. The central PPtP server must have public, static IP (it must be visible for the remote NASes).
Create pppoe dialer on remote mikrotik and add public ip of main Mikrotik, PPtP server will assign static local IPs to remote mikrotik via PPtP tunnels.

All remote mikrotik’s will reach the RADIUS server via PPtP tunnels. RM will consider all remote Mikrotik as local connections.

Using this method remote NASes can use any IP (public, local, static, dynamic) and RADIUS server will see them on local, static IP addresses, via the MAIN Mikrotik PPtP tunnels. Tunnels are used for RADIUS packets only (low traffic), while the heavy Internet traffic is going through the main connection of Remote Mikrotik. (Fiber, Satellite, DSL etc.)

Thanks for the reply Sir!

is there a link on where i can study the scripts? im still new to networking and need some supplementation. i really appreciate all the help. hoping yo can redirect me to a particular source..

thanks!