> [...]
> iptables -t mangle -A PREROUTING -i eth1 -j IMQ --todev 0
>
> tc filter add dev imq0 parent 1: prio 0 protocol ip handle 2 fw flowid 1:10
> tc filter add dev imq0 parent 1: prio 1 protocol ip handle 3 fw flowid 1:20
> iptables -t mangle -A PREROUTING -i eth1 -p tcp --dport 80 -j MARK > --set-mark 2
> iptables -t mangle -A PREROUTING -i eth1 -p tcp --dport 20 -j MARK
> --set-mark 3
> iptables -t mangle -A PREROUTING -i eth1 -p tcp --dport 21 -j MARK
> --set-mark 3
> [...]