What is the command line equivalent of unchecking "Enable Networking" (disabling networking) and then re-enabling?

In my environment, there are multiple networks which require me to physically move my network cable. Sometimes my connection does not refresh properly, so I disable/re-enable networking to refresh my connection. Being able to do this from the command line would be much more efficient for me.

I'm using 12.04 LTS.

6 Answers

I'd use the nmcli commands for that purpose:

nmcli nm enable false && nmcli nm enable true

man page:

DESCRIPTION nmcli is a command‐line tool for controlling NetworkManager and report‐ ing on its status. It is not meant as a full replacement for nm‐applet or other similar clients but as a complementary utility to those pro‐ grams. The main usage for nmcli is on servers, headless machines or for power users who prefer the command line. [...] nm NetworkManager Use this object to inquire and change state of NetworkManager. [...] enable [true|false] Get networking‐enabled status or enable/disable network‐ ing by NetworkManager. All interfaces managed by Net‐ workManager are deactivated when networking has been dis‐ abled. Reference to D‐Bus: interface: org.freedesktop.NetworkManager method: Enable arguments: TRUE or FALSE

1

Please try:

sudo service network-manager restart

1

You can try:

nmcli connection reload

It will reload all connection files from disk.

You could try ifdown and ifup to disable and then enable the interface. Assiming the name is eth0:

sudo ifdown eth0
sudo ifup eth0

If the problem is reassigning an IP to the interface and you don't want to bring it down completely, you can just request a new one with dhclient:

sudo dhclient eth0

Best commands in my opinion:

They disables network manager off and on. It is an exact equivalent of unchecking enable networking, and re-checking it to regain connectivity.-

nmcli networking offhitenter

nmcli networking onhit enter

Hope this helps.

Cheers!.-

To reload all connection files from the disk (for instance after updating the vpn password), you can simply sudo nmcli c reload

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