interface Ethernet0/0 no shut full-duplex ip address 200.200.12.2 255.255.255.0 ip nat outside ! interface Ethernet1/0 full-duplex no shut ip address 192.168.23.2 255.255.255.0 ip nat inside ! ip access-list standard NAT permit 192.168.0.0 0.0.255.255 ! ip nat inside source list NAT interface Ethernet0/0 overload