HP-UX IPSec version A.02.00 Administrator's Guide

HP-UX IPSec and IPFilter
IPFilter and IPSec Basics
Chapter 6192
There is no overlap in the configurations of IPFilter and IPSec in this
network topology, so there are no conflicts in Scenario One.
CAUTION IPSec and NAT are not compatible. If you are using HP-UX IPFilter with
IPSec, do not use NAT functionality.