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

gistfile1.sh

#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/
#Setup the rate control and delay
sudo tc qdisc add dev enp3s0 root handle 1: htb default 12

# rate control - slow outgoing traffic
sudo tc class add dev enp3s0 parent 1:1 classid 1:12 htb rate 56kbps ceil 128kbps

# delay and packet loss
sudo tc qdisc add dev enp3s0 parent 1:12 netem delay 1000ms loss 80%


# remove the config
sudo tc qdisc del dev enp3s0 root


# to see what is configured on an interface, do this
sudo tc -s qdisc ls dev enp3s0

# use ifconfig (if on Ubuntu) to see which interfaces you have to replace enp3s0 with other value