Readability: Lists And Names

	clients = "192.168.103/24"
        backupserver = "192.0.2.227"
	bacula_ports = "9101:9103"
	tcp_ports = "{ ftp, domain, ntp, whois, www, https, auth, nntp, imaps, rtsp, submission 8080:8082 }"
	udp_ports = "{domain, ntp}"
	block
	pass inet proto tcp from $clients to port $tcp_ports
	pass inet proto udp from $clients to port $udp_ports
	pass inet proto tcp from $backupserver to $clients port $bacula_ports

Load the sample file

$ sudo pfctl -vnf samples/example005