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I am sorry to ask about this again, but i cannot figure out, even after reading a lot of articles, how to change my network configuration from command line, without having to restart the machine.

I am using a copy of Lubuntu 14.04.2 LTS, which runs in a VirtualBox VM, and boots up without a GUI interface.

When i want to change my network connection settings using terminal, i usually edit 

/etc/network/interfaces

and then 

/etc/init.d/networking restart

or

service networking restart

But the above steps that used to work in most of the *ubuntu versions, now seem to do nothing.

I also tried ifdown/ifup and ifconfig, but nothing seems to be able to restart the connection and apply the new settings.

The settings are applied only if i restart the machine completely.

Is there something i might be missing, or am i stuck with the restart option? Thanks in advance..

EDIT : Extra info This is how my interfaces file looks like

Pastebin link : /etc/network/interfaces

ktsangop
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  • Are you trying: sudo ifdown eth0 && sudo ifup -v eth0 substituting for eth0 if it is not your relevant interface? – chili555 Mar 10 '15 at 16:47
  • The truth is that i tried so many commands, that i don't remember all the arguments i have used. I did try sudo ifdown --exclude=lo -a && sudo ifup --exclude=lo -a which works in ubuntu server 14.04 but it didn't work. – ktsangop Mar 11 '15 at 10:25
  • Please tell us what you are trying to accomplish with eth0:1. It has no reachable gateway. Thanks. – chili555 Mar 11 '15 at 12:43
  • I am running a server-client application. My backend requires internet but my clients are not allowed to access it. So as a simple solution the clients communicate with the server using the eth0:1 virtual adapter. I have been using this setup many years successfully with older versions of ubuntu. – ktsangop Mar 11 '15 at 13:29

2 Answers2

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What parameters are you trying to change?

If you are changing your IP to a fixed one maybe the problem is with the router.

Also, when running the restart command, root privileges are needed:

sudo service networking restart

You can also try to do:

sudo service networking stop
sudo service networking start

Some links with possible solutions: link1, link2, link3, link4.

Community
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Zaka Elab
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  • I am runnig the commands as root so that is not the problem. – ktsangop Mar 11 '15 at 10:26
  • What about the parameters you are trying to change? – Zaka Elab Mar 11 '15 at 16:37
  • I updated my question it's all up there :) – ktsangop Mar 12 '15 at 12:16
  • I added some links that might be useful. – Zaka Elab Mar 12 '15 at 14:23
  • Although your answer is 100% correct, it might also become 100% useless if that link is moved, changed, merged into another one or the main site just disappears... :-( Therefore, please [edit] your answer, and copy the relevant steps from the link into your answer, thereby guaranteeing your answer for 100% of the lifetime of this site! ;-) You can always leave the link in at the bottom of your answer as a source for your material... – Fabby Mar 18 '15 at 11:49
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After many attempts and system re-installation i managed to do it this way :

ip addr flush dev eth0
ifdown --exclude=lo -a && ifup --exclude=lo -a

Thanks for all the suggestions.

EDIT :

To help novice users like myself i would like to add that if you want to do this remotely using ssh, you would have to execute the above commands in one statement like this :

ip addr flush dev eth0 && ifdown --exclude=lo -a && ifup --exclude=lo -a

You will be disconnected of course but then you can re-connect on your new ip.

ktsangop
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