The problem is the following:

The customers ask me if possible send them the packets from an interface defined.

What does that mean? IP of the original NAS packet? That's in internal attribute Packet-Src-IP-Address.

My Radius proxy listen on an IP address (i.e. 192.168.1.3) for authentication packet and forwarding them towards two different networks (i.e. 192.168.14.4(Customer1) and 192.168.24.4(Customer2))

Ivan Kalik Kalik Informatika ISP