ipf(8) on FreeBSD
The text 1f0d29be5518, as FreeBSD 8.0-RELEASE shipped it.
alters packet filtering lists for IP packet input and output
Flags it lists
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-6 -
-A -
-D -
-E -
-F -
-I -
-P -
-T -
-V -
-Z -
-c -
-d -
-f -
-l -
-n -
-o -
-r -
-s -
-v -
-y -
-z