Make your internet like the 80ies

go-slow.sh

#!/bin/bash

help() {
  echo 'G o  S L O W  ...'
}

stop() {
  sudo ipfw delete 1
  sudo ipfw delete 2
  sudo ipfw pipe 1 delete
  echo "Its off now!"
}

start() {
  stop
  echo "Setting to $1ms"
  sudo ipfw pipe 1 config bw 512Kbit/s delay $1ms
  # For packet loss, add plr <n>, where <n> is a floating point number between 0 and 1 (0 meaning no loss, and 1 meaning that all packets are discarded). This will for example simulate a mobile lossy connection pretty well.

  sudo ipfw add 1 pipe 1 src-port 80
  sudo ipfw add 2 pipe 1 dst-port 80
}

# sudo ipfw pipe 1 config bw 16Kbit/s delay 350ms

case "$1" in
  stop|off|down) stop ;;
  start|on|up) start $2 ;;
  *) help ;;
esac