Linux – Simulate a network cable unplugged without losing all routes

iproutelinuxnetworking

I want to simulate unplugging a cable from a Linux instance. My initial response was ip link set eth0 down. However, this command has impact on higher-level networking functions, e.g. routes (including default route) are removed, etc. When I "plug it back in" with ip link set eth0 up, the routes now are missing.

How can I simulate unplugged network without using down, or conversely tell iproute2 to just cause the network cable to be disconnected?

Best Answer

Try this command:

nmcli device disconnect eth0

To turn interface on, use this command.

nmcli device connect eth0

Note: Please change eth0 to your interface device.

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Linux Network Simulation – How to Simulate Unplugged Network Cable or Down Server

Just bring the interface down. For example, with eth0:

ip link set eth0 down

To bring the interface back up:

ip link set eth0 up

Linux – Simulate ethernet cable unplugged on a remote machine while staying connected

Use aliases look as best possible hit. But in this configuration only "interface down" situation can be simulated. Look impossible to clean simulate "Link down" situation.

For full test, management connection over serial port rather ssh can be used.

Your WS <-ssh-> Neighbor_to_testhost <-serial-> Test_Host

Best Answer

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Linux Network Simulation – How to Simulate Unplugged Network Cable or Down Server

Linux – Simulate ethernet cable unplugged on a remote machine while staying connected

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