forwarding vpn ip addresses

I have a L2TP VPN client interface on my RB2011. I have one computer on my network that will be routed through this connection. My problem is the client needs to know what ip was assigned on the VPN connection. So when I look at the status of the l2tp interface and see a local ip address of 10.10.93.4, I would like the client to know that IP address.

Please advise.