pass in exp { "ip.src != 1.1.1.0/24; tcp.dport = 80;" } 
pass in exp { "ip.addr = 1.2.3.4/32,5.6.7.8/32;" } 
block out exp { "ip.dst = 127.0.0.0/8;" } 
block in exp { "udp.sport = 53; udp.dport = 53;" } 
pass out exp { "tcp.sport = 22; tcp.port = 25;" }