When developing a web application sometimes it's desired to simulate a slow network connection. Netem does just that.
https://wiki.linuxfoundation.org/networking/netem
https://stackoverflow.com/questions/1094760/network-tools-that-simulate-slow-network-connection
Cheat-sheet:
To add: sudo tc qdisc add dev lo root netem delay 100ms To remove: sudo tc qdisc del dev lo root netem delay 100ms – freeall May 17 '12 at 10:54
You can completely reset all tc rules for loopback with the single command sudo tc qdisc del dev lo root - change lo to eth0 if you're using a wired connection etc – Hamish Downer Sep 18 '13 at 14:26