LagFactory script

Goal

This bash script uses Netem to simulate delay and packet loss to a given target.

Using it

You need first to edit parameters at the start of the script to specify the network interfaces and target

IFACE="eth0 eth2" # Input and output interface to simulate lag in INPUT and OUTPUT
TARGET="192.168.1.0/24" # Host or network to apply lag on

Then, you will simply need to run as root something like

lagfactory.sh start 200 50 4000 100
 BANDWIDTH : 200 kbit
 LOSS : 50 %
 DELAY : 4000 ms
 VAR : 1000 ms

This will simulate a delay of 4 sec (plus or minus 1 sec) for all packets going to ''192.168.1.0/24'' via ''eth0'' and coming back from ''192.168.1.0/24'' via ''eth2''. There is also a 50 percent packet loss on these packets. The network bandwidth will be limited to 200 kbit.

To ease administrator work, SSH trafic is not affected by this modification of network property.