Openswan		  NAT-	      Internet      NAT-             Openswan                (openswan server Subnet) 
 (Client Subnet 10.10.10.0/24)   ...  Client  --------- device  ===================device-------- Server (192.168.1.1 )... 1 20.20.20.0/24
 				     192.168.0.2        /    \                     /  \
 				     		       /      \                   /    \
 					192.168.0.1/24      X.X.X.X          Y.Y.Y.Y    192.168.1.2