ipfw(8) on FreeBSD
The text 90c4ca9c0a7e, as FreeBSD 8.0-RELEASE shipped it.
IP firewall and traffic shaper control program
Flags it lists
-
-N -
-S -
-T -
-a -
-b -
-c -
-d -
-e -
-f -
-i -
-n -
-q -
-s -
-t