Ubuntu: how do I refresh my wired ethernet connection from command line?



Question:

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.


Solution:1

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  


Solution:2

Please try:

sudo service network-manager restart  


Solution:3

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  


Solution:4

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 off hitenter

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nmcli networking on hit enter

enter image description here

Hope this helps.

Cheers!.-


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