Configure VPN server in windows server 2003 using 1 NIC behind a router

I have 1 server 2003 want to set to VPN server that have 1 NIC that connect to LAN and Internet. And a router that connect to internet.
IP address win2003server : 192.168.0.10
subnet mask : 255.255.255.0
Default gateway : 192.168.0.1

IP Router : 192.168.0.1
subnet mask : 255.255.255.0
Internet IP : 222.46.52.156
subnet mask : 255.255.255.0

My question is how to configure VPN server in windows server 2003 that just have 1 NIC? Can anybody help me to solve this problem? what need I set to windows server 2003 and Router??

Please somebody answer me….