Emulate slow Internet connection speed on localhost with netem (Ubuntu)

slowconnection

#!/bin/bash

# Refer: http://www.linuxfoundation.org/collaborate/workgroups/networking/netem#Delaying_only_some_traffic
# Refer: http://www.bomisofmab.com/blog/?p=100
# Refer: http://drija.com/linux/41983/simulating-a-low-bandwidth-high-latency-network-connection-on-linux/

case "$1" in
    start)
        # Setup the rate control and delay
        sudo tc qdisc add dev lo root handle 1: htb default 12
        sudo tc class add dev lo parent 1:1 classid 1:12 htb rate 56kbps ceil 128kbps
        sudo tc qdisc add dev lo parent 1:12 netem delay 200ms
        ;;
    stop)
        # Remove the rate control/delay
        sudo tc qdisc del dev lo root
        ;;
    status)
        # To see what is configured on an interface, do this
        sudo tc -s qdisc ls dev lo
        ;;
    *)
        echo "Emulate slow Internet connection speed on localhost with netem (Ubuntu)"
        echo "Original script https://gist.github.com/trongthanh/1196596"
        echo "Usage $0 {start|stop|status}"
        ;;
esac