![Forrest logo](/images/logo.png)
tc:tldr:98664
This command is used to add network emulation to the specified network interface using the Traffic Control (tc) command-line utility.
Let's break down the different parts of the command:
-
tc
: It stands for Traffic Control, a command-line utility used to configure the Linux kernel's networking stack. -
qdisc
: It stands for Queueing Discipline. A queueing discipline is a module within the kernel that determines how packets are queued and processed. -
add
: It specifies the action of adding a new queueing discipline to the network interface. -
dev ${eth0}
: It specifies the network interface to which the queueing discipline will be added.${eth0}
is a placeholder for the actual network interface name, typically in the format eth0, eth1, etc. -
root
: It specifies that the newly added queueing discipline will be the root of the hierarchy. The root queueing discipline is responsible for controlling the overall characteristics of the network traffic. -
netem
: It stands for Network Emulation, which is a queueing discipline that emulates various network conditions like delay, packet loss, etc. -
delay ${delay_in_milliseconds}ms
: It is a parameter of the netem queueing discipline, where${delay_in_milliseconds}
is a placeholder for the desired delay in milliseconds. This parameter introduces a delay in the network traffic, simulating the effect of network latency.
Therefore, the given command is used to add network emulation with a delay to a specific network interface (${eth0}), introducing a delay of ${delay_in_milliseconds} milliseconds in the network traffic passing through it.