ipf(8) on FreeBSD
The text 13fe0c18b97a, as FreeBSD 11.1-RELEASE shipped it.
alters packet filtering lists for IP packet input and output
Flags it lists
-
-6 -
-A -
-D -
-E -
-F -
-I -
-P -
-T -
-V -
-Z -
-c -
-d -
-f -
-l -
-n -
-o -
-r -
-s -
-v -
-y -
-z