Connection Simulation with ipfw

# IP Firewall and Traffic Shaper control program
man ipfw                        # ipfw manual
sudo ipfw add pipe 1 all from any to any        # define new pipe for our traffic to go through
sudo ipfw pipe 1 config bw 200Kbit/s delay 500ms    # To limit all traffic to 200Kbit/s with a 500ms delay
sudo ipfw flush                     # delete all rules