Netem

adds a fixed amount of delay to all packets going out of the local Ethernet

   tc qdisc add dev eth0 root netem delay 100ms

add random variation(100ms ± 10ms)

   tc qdisc change dev eth0 root netem delay 100ms 10ms

delay to be 100ms ± 10ms with the next random element depending 25% on the last one

   tc qdisc change dev eth0 root netem delay 100ms 10ms 25%

   tc qdisc change dev eth0 root netem delay 100ms 20ms distribution normal

loss(smallest possible non-zero value is 0.0000000232%)

   tc qdisc change dev eth0 root netem loss 0.1%

causes the random number generator to be less random and can be used to emulate packet burst losses

   tc qdisc change dev eth0 root netem loss 0.3% 25%   (prob(n) = .25 * prob(n-1) + .75 * random )

   tc qdisc change dev eth0 root netem duplicate 1%

   tc qdisc change dev eth0 root netem corrupt 0.1%     introduces a single bit error at a random offset in the packet

reorders every Nth packet-every 5th packet to be sent immediately and other packet to be delayed by 10ms

   tc qdisc change dev eth0 root netem gap 5 delay 10ms

25% of packets (with a correlation of 50%) will get sent immediately, others will be delayed by 10ms

   tc qdisc change dev eth0 root netem delay 10ms reorder 25% 50%

   tc qdisc change dev eth0 root netem delay 100ms 75ms

list current rules

   tc -s qdisc ls dev eth0

delete all rules

   tc qdisc del dev eth0 root

   tc -s qdisc ls dev eth0