Linux TC

setBandwidthAndDelay.sh

#!/bin/bash
#
###############################################################################
# Script used for setting bandwidth and delay.                                #
###############################################################################
#

# bandwidth in kilobytes
BANDWIDTH="640"
# time to reach other server (RTT will be 2xlonger=40ms)
DELAY="250"
# network to set (default is for all IPs)
network="0/0"
# interface on which we set bandwidth and delay
interface="bond0"

STOP_ACTION="stop"
START_ACTION="start"
STATUS_ACTION="status"

function setBandwidth() {
  tc qdisc add dev $interface root handle 1:0 htb
  tc class add dev $interface parent 1: classid 1:1 htb rate ${BANDWIDTH}kbps
  tc filter add dev $interface parent 1:0 prio 1 protocol ip u32 match ip dst $network flowid 1:1
  # last rule for limiting per outgoing destination port:
  # tc filter add dev eth0 parent 1:0 prio 1 u32 match ip dport ${destination} 0xffff flowid 1:1
}

function unsetBandwidth() {
  tc filter del dev $interface parent 1:0 prio 1 protocol ip u32 match ip dst $network flowid 1:1
  tc class del dev $interface parent 1: classid 1:1 htb rate ${BANDWIDTH}kbps
  tc qdisc del dev $interface root handle 1:0 htb
}

function setDelay() {
  tc qdisc add dev $interface parent 1:1 netem delay ${DELAY}ms
}

function unsetDelay() {
  tc qdisc del dev $interface parent 1:1 netem delay ${DELAY}ms
}

function showStatus() {
  tc qdisc
  tc class show dev $interface
  tc filter show dev $interface
}

function setParameters() {
  # check if network address is given as parameter
  if [ -z "$1" ]; then
    echo "No parameters specified. Using default network address=$network and default interface $interface."
  else
    network=$1
    if [ -z "$2" ]; then
      echo "No interface specified. Using default interface $interface."
    else
      interface=$2
    fi
  fi
}

function usage() {
cat <<EOF
Usage: $0 [$START_ACTION|$STOP_ACTION|$STATUS_ACTION] <ip> <interface>
      <ip>  the network address where limits will be applied
            example:    172.16.100.0/24 -- network
                        0/0 		-- all IP traffic

Script does not do any checks so be sure about what are you doing!
EOF
}

###############################################################################
# Start of script.                                                            #
###############################################################################

action=$1

case $action in
  $STOP_ACTION)
    setParameters $2 $3
    unsetDelay
    unsetBandwidth
    ;;
  $START_ACTION)
    setParameters $2 $3
    echo -e "Limiting connection via $interface for all traffic going to $network \nbandwidth = $BANDWIDTH kBytes/s   delay = $DELAY ms"
    setBandwidth
    setDelay
    ;;
  $STATUS_ACTION)
    setParameters $2 $3
    showStatus
    ;;
  *)
    usage
esac