Hi,
This command is available in PIX 6.x.
".. Use a 'natid' of 0 with the 'outside' option to disable address translation of hosts residing on the lower security interface. Use this option only if outside dynamic NAT is configured on the interface. By default, address translation is automatically disabled for hosts connected to the lower security interface.."
More info is available at:
http://www.cisco.com/en/US/products/sw/secursw/ps2120/products_configuration_guide_chapter09186a00800eb71e.html#wp1063701
Rgds,
AK
