Set Up the VPN2S Address Mapping (One-to-One) 
In the VPN2S, go to WAN / Internet > WAN Setup. 
 
Click Configuration > WAN / Internet > WAN Setup > Choice WAN1 > Edit to open the 
follow screen. 
 
2.  In the VPN2S, go to NAT > Address Mapping. 
Click Configuration > NAT > Address Mapping > Add to open the follow screen.