HP-UX IPFilter v18.21 Administrator Guide HP-UX 11i v3 (761995-001, March 2014)

Enabling and disabling NAT functionality
The new ipnat_enable tunable is provided to enable/disable NAT functionality. By default,
this tunable is set to 1. If you do not use NAT functionality, disabling this tunable will improve
performance.
NOTE: This available only on 11i v3.
Enabling and disabling NAT functionality 121