pass in all flags S/SA keep state
pass in all no state
pass in proto tcp from any port <= 1024 to any flags S/SA keep state label "foo_bar"
pass in proto tcp from any to any port = smtp flags S/SA keep state
pass in inet proto tcp from 10.0.0.0/8 port > 1024 to ! 10.1.2.3 port != ssh flags S/SA keep state
pass in inet proto igmp from 10.0.0.0/8 to 10.1.1.1 keep state allow-opts
pass in inet proto tcp from 1.2.3.4 to any flags S/SA keep state label "6:tcp:1.2.3.4::any:"
pass in inet proto tcp from 1.2.3.5 to any flags S/SA keep state label "7:tcp:1.2.3.5::any:"