I need to forward RADIUS traffic from an external WLAN controller (customer's network with no routing to my priavte network) to my RADIUS server which is on a private routed network i.e. the WLAN controller does not have any routing to my RADIUS server and vice versa. The RADIUS server (10.0.50.30) communicates to my customer router via a private PPTP tunnel. The WLAN Controller send 802.1x traffic to ---> 192.168.0.9 (RB1 - Customer router) and I need this traffic to reach my RADIUS server.

I want to forward the 802.1x traffic from the WLAN controller to my RADIUS server which connects to the Customer router via a PPTP tunnel as per the below.
802.1x <---> (External IP: 192.168.0.9) RB1 (Internal IP: 10.0.0.226) <---PPtP---> (10.0.0.1) RB2 (10.0.50.1)<---> RADIUS Server (10.0.50.30)

I have configured the following dst-nat on RB1, but I don't think this will work as my understanding is that dst-nat can only be applied to local addresses, i.e. RB1 will not forward the traffic to RB2 via the PPTP tunnel.
Will the above work or am I correct that dst-nat can only be applied for local addresses? If dst-nat can only be used locally, how do I get RB1 to NAT and forward this traffic to RB2. Do I use the netmap function instead?

Thanks,

Nico

To answer my own question. It is as straight forward as configuring the dst-nat. The to-addresses does not have to be locally connected to the router on one of its physical interfaces.