in_if="em0"
out_if="em1"
management_if="em2"
in_ip="100.100.100.1"
out_ip="200.200.200.1"
management_ip="172.16.0.201"
client1_subnet="192.168.5.0/26"
client2_subnet="192.168.6.0/26"
server_subnet="192.168.7.0/24"

download_bandwidth="6144Kbit/s"
upload_bandwidth="1024Kbit/s"
delay="0"
queue_size="10"

cmd="ipfw"

$cmd add 10 allow all from any to any via lo0

$cmd pipe 100 config mask src-ip 0xffffffff bw $upload_bandwidth queue $queue_size delay $delay
$cmd pipe 200 config mask dst-ip 0xffffffff bw $download_bandwidth queue $queue_size

$cmd add pipe 100 all from $client1_subnet to $server_subnet in via $in_if
$cmd add pipe 200 all from $server_subnet to $client1_subnet out via $in_if

$cmd add pipe 100 all from $client2_subnet to $server_subnet in via $in_if
$cmd add pipe 200 all from $server_subnet to $client2_subnet out via $in_if

$cmd add 10000 allow all from any to any via $management_if
$cmd add 20000 allow all from any to any via $in_if
$cmd add 30000 allow all from any to any via $out_if