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pass in all flags any no state
pass in from any to any flags any no state
pass in proto tcp from any port <= 1024 to any flags any no state label foo_bar
pass in proto tcp from any to any port = 25 flags any no state
pass in proto tcp from 10.0.0.0/8 port > 1024 to ! 10.1.2.3 port != 22 flags any no state
pass in proto igmp from 10.0.0.0/8 to 10.1.1.1 allow-opts no state
pass in proto tcp from { 1.2.3.4, 1.2.3.5 } to any flags any no state label \
"$nr:$proto:$srcaddr:$srcport:$dstaddr:$dstport"
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