Client Isolation & Traffic Redirection

Simple question for all you gurus!

I've got a setup like so:

ADSL Router:10.0.0.2 | |10.0.0.3 SERVER |192.168.0.1 | AP:192.168.0.254-------Client:192.168.0.2 | | Client:192.168.0.3

I want 192.168.0.3 to be able to talk to 192.168.0.2, via the SERVER. (I disable the AP forwarding the packets, for this purpose - client isolation)

How do I set it up?

THANKS!!