Unlike ifup command the user can use ifdown command to bring network interface down, not allowing the user to transmit and receive data. Technically it places the network interface in a state where it cannot transmit or receive data. It is used to configure network interfaces based on interface definitions in the file /etc/network/interfaces.
Syntax:
ifdown [-nv] [–no-act] [–verbose] [-i FILE|–interfaces=FILE] [–allow CLASS] -a|IFACE…
Options:
-
-a(–all): This option is used to bring all the interface down which are defined in /etc/network/interfaces.
- –allow=CLASS: This option will only allow interfaces listed in an allow-CLASS line in /etc/network/interfaces to be acted upon.
- -v(–verbose): Show or verbose commands as they are executed.
- -V(–version): Prints the Copyright and version information.
Example:
- Let us execute a ping command to check the working of my interfaces, they are already configured.
- Now try to down the interface down using the following command. Here, sudo is used for permissions, -a to work on all devices and v for verbose the output.
sudo ifdown -av
- Let us check our ping test and browser.
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