Using TC to simulate network delay and packet loss under Linux

Bandwidth or flow rate unit:

Kbps	Kbyte/sec	Kilobytes per second
Mbps	Mbyte/sec	Megabytes per second
Kbit	Kbits/sec
Mbit	Mbits/sec

1 , Analog Delay Transfer

# TC Qdisc Add dev eth0 root netem delay 100ms

This command sets the transmission of the eth0 NIC to a delay of 100 milliseconds to send.

In a more realistic case, the delay value will not be so accurate, there will be a certain fluctuation, we can use the following conditions to simulate the delay value with volatility:

# TC Qdisc Add dev eth0 root netem delay 100ms 10ms

This command sets the transmission of the ETH0 network card to a delay of 100ms±10ms (any value between a maximum of $ ms).

The randomness of this fluctuation can also be further enhanced:

# TC Qdisc Add dev eth0 root netem delay 100ms 10ms 30%

This command sets the transmission of the eth0 NIC to 100ms, and approximately 30% of the packets delay the ±10MS send.

2 , analog network packet loss

# TC Qdisc Add dev eth0 root netem loss 1%

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

You can also set the success rate of packet loss:

# TC Qdisc Add dev eth0 root netem loss 1% 30%

This command sets the transmission of the eth0 NIC to randomly discard 1% of packets, with a success rate of 30%.

3 , simulated packet duplication

# TC Qdisc Add dev eth0 root netem duplicate 1%

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

4 , simulated package corruption

# TC Qdisc Add dev eth0 root netem corrupt 0.2%

This command sets the transmission of the eth0 NIC to a randomly generated 0.2% corrupted packet. (kernel version is required at 2.6.16 or more)

5 , simulation package chaos sequence

# TC Qdisc Change dev eth0 root netem delay 10ms reorder 25% 50%

This command sets the transmission of the eth0 NIC to: 25% of the packets (50% related) are sent immediately, and the other is delayed by 10 seconds.

In the new version, the following command will also disrupt the order of the packages to some extent:

# TC Qdisc Add dev eth0 root netem delay 100ms 10ms

Using TC to simulate network delay and packet loss under Linux