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The Intermediate Queue

Is a netfilter hook into the special 'imq' device:

$ iptables -t mangle -A PREROUTING
  -i eth0 -j IMQ --todev 0
$ ip link set imq0 up

To slow down incoming http traffic:

$ iptables -t mangle -A PREROUTING 
  -i eth0 -p tcp --sport 80 
  -j IMQ --todev 0
$ tc qdisc add dev imq0 root tbf 
  rate 220kbit limit 3000 burst 1500