# first matching rule wins; port 0 means any port
allow tcp port=80 src=192.168.0.0/16
deny tcp port=22 src=0.0.0.0/0
allow udp port=53 src=10.1.0.0/16
allow tcp port=5432 src=10.2.3.0/24
allow tcp port=22 src=10.0.0.0/8
deny udp port=53 src=0.0.0.0/0
deny tcp port=23 src=0.0.0.0/0
allow tcp port=443 src=0.0.0.0/0
deny any port=0 src=0.0.0.0/0