Understanding the network.pdf - Back to Home

This approach allows the administrator to define NAT translation service on a
host-by-host or network-wide basis. If all local networks are eligible, the "any any"
ACL can be used. When the list is created,
dynamic translation is enabled using the command, referring to the ACL number and outside address pool
name. This example utilizes the translation pool we created in the previous section:
sartre(config)#ip access-list 4 permit any any
sartre(config)#ip nat inside source list 4 pool sartre-NAT overload
Due to the small outside address pool, overload is enabled for more efficient use of
the translation address pool.
NAT Interface Specification
When the source translation eligibility and outside address pool list definitions are
completed, the inside and outside NAT translation interfaces must be defined.
Interfaces are defined with the interface configuration subcommand and :
sartre(config)# interface s0
sartre(config-int)#ip address 12.14.116.5 255.255.255.252
sartre(config-int)# ip nat outside
sartre(config-int)#exit
sartre(config)# interface e0
sartre(config-int)#ip address 192.168.1.1 255.255.255.0
sartre(config-int)# ip nat inside
sartre(config-int)#exit
When both interfaces are configured, NAT is up and running. To see NAT translation
table and operational statistics, the user EXEC commands and are available. To clear NAT
translations, you can use the privileged EXEC command .