To configure inbound NAT on the Cisco VPN 3000 Concentrator, perform these steps:
Log in to the Concentrator through HTTP or HTTPS.
Go to Configuration > Policy Management > Traffic Management > NAT > Enable.
Select LAN-LAN NAT Rules. Click Apply.
Go to Configuration > Policy Management > Traffic Management > NAT > LAN-LAN NAT Rules.
Select Static. Configure the source address, translated address and the destination address with correct relevant wildcard masks.
Note: The source address is the remote address.The destination address is the local address behind the Concentrator. The translated address is the one into which the remote address should be translated.
For example, the remote network is 188.8.131.52 255.255.255.0. If the network behind the Concentrator is 184.108.40.206 255.255.255.0, and you want the remote network to be visible as 220.127.116.11 255.255.255.0, it would look like this: