HP-UX IPFilter A.03.05.13 Release Notes: HP-UX 11i v3

HP-UX IPFilter Release Notes
Known Problems and Workarounds
Chapter 16
Known Problems and Workarounds
The startup script for HP-UX IPFilter automatically disables the
ip_forward_directed_broasts
parameter. This keeps the system from being subjected
to broadcast-storm attacks that can bring down a network.