Have you read this HOWTO:
HOWTO: Expanding the scope of the VPN to include additional machines
Make sure IP Forwarding is enabled.
Also, although it is technically ok .. using 10.161.
126.0/24 for your server lan and 10.161.
127.0/24 for your VPN could cause you configuration problems if you type something wrong .. I would
advise you choose a more unique VPN IP subnet.