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How to configure bi-directional NAT on the PIX/Adaptive Security Appliance (ASA) Firewall
Cisco PIX 6.2 and later versions allow the application of Network Address Translation (NAT) and Port Address Translation (PAT) to traffic from an outside interface to an inside interface. This feature is referred to as bi-directional NAT. An outside interface is less secure, whereas an inside interface is considered more secure.
Outside NAT/PAT is similar to inside NAT/PAT, but the address translation is applied to addresses of hosts that reside on the outer interfaces of the PIX, which are less secure.
In order to configure dynamic outside NAT, specify the addresses to be translated on the outside interface, which is less secure. Then specify the global address or addresses on the secure inside interface.
In order to configure static outside NAT, use the static command to specify the one-to-one mapping.