tc qdisc add dev eth0 root handle 1: htb default 30
tc class add dev eth0 parent 1: classid 1:1 htb rate 100kbps ceil 100kbps
tc class add dev eth0 parent 1:1 classid 1:10 htb rate 50kbps ceil 100kbps
tc class add dev eth0 parent 1:1 classid 1:20 htb rate 30kbps ceil 100kbps
tc class add dev eth0 parent 1:1 classid 1:30 htb rate 20mbps ceil 100kbps

tc filter add dev eth0 protocol ip parent 1:0 prio 1 u32 match ip dport
80 0xffff flowid 1:10
tc filter add dev eth0 protocol ip parent 1:0 prio 1 u32 match ip dport
25 0xffff flowid 1:20

iperf -s -p 25 -i 1
iperf -s -p 80 -i 1

iperf -c 192.168.90.4 -p 25 -t 60
iperf -c 192.168.90.4 -p 25 -t 60