HP-UX IPFilter V17.05 Administrator Guide

2. Filter rules
If you want to use filter and NAT rules to process inbound packets, you must specify the translated
(target) IP address in the filter rules.
6.1.2.1.2 Outbound Packets
When processing outbound packets, IPFilter evaluates rules in the following order:
1. Filter rules
2. NAT rules
62 Configuring and Loading Network Address Translation (NAT) Rules