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I have a modem that can be accessed with my brother. Sometimes my brother plays internet games and it makes my connection slower.

Can I cut my brother internet connection via terminal? If not, which packages / software I should use if there isn't any facilities for cutting the connection.

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are you talking about router? Oh what means " can be accessed with my brother"? – titusjaka Nov 1 '12 at 8:42
Sorry, I mean cut other computer connection – lambda23 Nov 1 '12 at 11:24

Yes, indeed you can.

To do this, we use a command line utility (which should be already installed) for network manager called nmcli.

To disconnect

you need to run the following command:

nmcli dev disconnect iface eth0

Note: You need to make sure that the iface value for the connection is eth0, you can do so by taking a look at the status of all the devices:

nmcli dev status

nmcli dev status output

Note that, in this case, eth0 is connected, hence the iface value is eth0.

To connect again

you need to know the uuid of the connection. Run the following command:

nmcli con

and note the uuid of your connection.

Then, to connect to that connection, run

nmcli con up uuid <uuid>

where <uuid> is the uuid you noted from the previous command.

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