What are the main differences between the Cisco IOS® Software and Cisco PIX Security Appliance implementations of NAT?

Cisco IOS software-based NAT is not fundamentally different from the NAT function in the Cisco PIX Security Appliance. The main differences include the different traffic types supported in the implementations. Refer to NAT Configuration Examplesfor more information on the configuration of NAT on Cisco PIX devices (includes the traffic types supported).