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The steps are similar for single-address static NAT configuration:
1. Configure network objects. Configure a network object for each internal host with a static NAT static statement specifying the outside address to be used and the service types (port numbers) to be forwarded. These identify the internal hosts, the desired outside IP address, and the type of service to be forwarded. (The exclamation marks are for formatting to improve readability and are not required for the configuration.)
object network WebServer-HTTP
nat (inside,outside) static 192.168.1.194 service tcp 80 80
object network WebServer-HTTPS
nat (inside,outside) static 192.168.1.194 service tcp 443 443
object network MailServer-SMTP
nat (inside,outside) static 192.168.1.195 service tcp 25 25
object network MailServer-POP3
nat (inside,outside) static 192.168.1.195 service tcp 110 110
Note that in the above configurations the host statement identifies the internal server (192.168.102.5 is the Web server and 192.168.102.6 is the mail server). The NAT statement identifies the external address used to forward the specified packets to the internal host.
2. Configure Access-Control Lists to permit the traffic flows. This Access-Control List permits the traffic flows against the security levels (each access-list statement goes on a single line).
access-list OutsideToInside permit tcp any host 192.168.102.5 eq 80
access-list OutsideToInside permit tcp any host 192.168.102.5 eq 443
access-list OutsideToInside permit tcp any host 192.168.102.6 eq 25
access-list OutsideToInside permit tcp any host 192.168.102.6 eq 110
3. Apply the Access-Control List to the outside interface with an access-group statement.
access-group OutsideToInside in interface outside
Here is the complete configuration:
Read more about lans & wans in Network World's LANs & WANs section.