Add latency to a linux server

In a simulation environment, it can be interesting to simulate latency.

! add 15ms latency
tc qdisc add dev eth0 root netem delay 15ms
! remove latency
tc qdisc del dev eth0 root netem delay 15ms

! check latency

tc -s qdisc

Problems after cloning Centos

ifconfig -a
vi /etc/udev/rules.d  -> edit this files and removes cloned macs.
rename interfaces to eth0,1,n