linux tc - simulate network latency and packet loss

vim tc_delay.sh

tc qdisc add dev eth0 root netem delay 100ms
tc qdisc show dev eth0
sleep 100
tc qdisc del dev eth0 root netem delay 100ms

 

 

# tc qdisc add dev eth0 root netem delay 100ms

This command sets the  eth0  network card's transmission to be sent with a delay of  100ms  .

In a more realistic situation, the delay value will not be so accurate, and there will be a certain fluctuation. We can use the following situation to simulate

Latency value with volatility:

# tc qdisc add dev eth0 root netem delay 100ms 10ms

This command sets the  eth0  network card's transmission to be sent with a delay of  100ms ± 10ms  ( any value between 90 and 110 ms  ).

# tc qdisc add dev eth0 root netem delay 100ms 10ms 30%

This command sets  the transmission of  the eth0  network card to 100ms  , and at the same time, about  30%  of the packets are sent with a delay of  ± 10ms  .

# tc qdisc add dev eth0 root netem loss 1%

This command sets  the transmission of the eth0  NIC to randomly drop  1%  of the packets.

# tc qdisc add dev eth0 root netem loss 1% 30%

This command sets  the transmission of the eth0  network card to randomly drop  1%  of the packets, with a success rate of  30%  .

Delete the relevant configuration on the network card: Change the add  in the previous command  to  del  to delete the configuration:

# tc qdisc del dev eth0 XXXXXXXXXXX (configuration added by yourself) This command will delete  the relevant transmission configuration of the eth0  network card

# tc qdisc del dev eth0 root netem delay 100ms

 

# tc qdisc add dev eth0 root netem duplicate 1%

This command sets  the transmission of the eth0  NIC to randomly generate  1%  duplicate packets. 6  Simulate packet corruption:

# tc qdisc add dev eth0 root netem corrupt 0.2%

This command sets the  eth0  NIC's transmission to randomly generate 0.2  %  corrupted packets. ( The kernel version needs to be above  2.6.16  )

 

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

This command sets  the transmission of the eth0  network card to : 25%  of  the packets ( 50% relevant) will be sent immediately the rest will be delayed by 10  seconds.

In the new version, the following commands will also disrupt the order certain extent : # tc qdisc add dev eth0 root netem delay 100ms 10ms

 

View configured network conditions: # tc qdisc show dev eth0