NetBSD/usr.sbin/ipf/rules/example.2

#
# block all outgoing TCP packets on le0 from any host to port 23 of host bar.
#
block out on le0 proto tcp from any to bar/32 port = 23
Import ip-filter 3.2beta5 1997-09-21 20:47:50 +04:00			`#`
			`# block all outgoing TCP packets on le0 from any host to port 23 of host bar.`
			`#`
Import IP Filter 3.2.5 1998-05-17 20:29:42 +04:00			`block out on le0 proto tcp from any to bar/32 port = 23`