A very simple example for when you want to very quickly get a network (for example, a branch office) online behind a DSL line or similar. This PATs all private network traffic behind the outside interface’s public IP.
interface FastEthernet0/0 description TO_ISP ip nat outside ! interface FastEthernet0/1 description TO_LAN ip nat inside ! ip access-list standard NAT_SOURCE permit 10.1.1.0 0.0.0.255 ! ip nat inside source list NAT_SOURCE interface FastEthernet0/0 overload

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