2 days search and try and read but just a small success

what i need:
server should reach the clients behind the router via openvpn tunnel.
other clients means printers, tablets and stuff which need broadcast traffic too.
so i need a tap tunnel.
i have created a successfully connection with tap0 to the router and i can ping the router.
but how the [beeeeep] can i reach the the clients behind the router ?
tap0 server: 192.168.70.2 <-> tap1 router: 192.168.70.220 (works)
the router itself give clients 1 192.168.0.x
gateway for clients: 192.168.0.1
Code: Select all
192.168.70.2 vpn:192.168.70.220
router/gatway: 192.168.0.1
------- -------------------
Server| - internet - |router (DD-WRT) | 192.168.0.x
------- |openvpn | -- Other clients
|inet gw. |
-------------------
i need a solution .. please

chris.