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Simple NAT (PAT) Example #1

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

Posted in CCIE Security.

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