How to Reset Ubuntu Network Without Reboot

cmnorton · 07-20-2008, 09:05 AM

Once in a while my home wireless network burbs, and I need to reconnect. . Kubuntu's network manager tries to reconnect to my network and hangs.

I have tried /etc/init.d/networking restart, and this does not cause a reconnect.

All I want to do is bring the network down and restart it without rebooting. Doing things like this is what makes Linux great; I'm just trying to research the steps.

neilneil2000 · 07-20-2008, 09:26 AM

Try these commands:

This will take down all interfaces:

Code:

sudo ifdown -a

This will bring them all back up again

Code:

sudo ifup -a

You can do it by interface, but you'll have to check out the man pages for that!

Clemente · 07-20-2008, 09:35 AM

Hi,

if you use knetworkmanager as your mentioned KDE Network Manager, restarting the networding script cannot work:

1)
The script does only handle network devices that are configured in /etc/network/interfaces (on debian an related distributions - others might have a coresponding file somewhere).
2)
The knetworkmanager does only manage devices that are _not_ listed in the interfaces file mentioned above. This is usefull for mobile network devices - like your wlan device.

Both ways to configure network devices work complementary.

If my WLAN hangs, I usually reconnect the device using the knetworkmanager GUI (translation could differ, I run no english system):

Code:

1) Right click the icon 
2) Select "Options" 
3) Select "Change to offline modus" 
Wait until everything is disconnected 
4) Repeat 1 and 2, select "Change to online modus" 
Wait until everything is reocnnected.

Perhaps, you have to select your WLAN manually after changing towards online modus.

Hope this one helps,
Greet-o-mente

Clemente · 07-20-2008, 09:38 AM

@neilneil2000:

IIRC, for those commands is the same valid:
They only manage devices configured in /etc/network/interfaces.
And if the op uses knetworkmanager - what I assume - the desired device is not configured there.

koen plessers · 07-20-2008, 01:01 PM

Hello

After bad experiences with networkmanager, I installed Wicd: http://wicd.sourceforge.net/

Also very easy to connect or disconnect.

Bye

Koen Plessers

cmnorton · 07-20-2008, 01:18 PM

Quote:

Originally Posted by Clemente

Hi,

if you use knetworkmanager as your mentioned KDE Network Manager, restarting the networding script cannot work:

1)
The script does only handle network devices that are configured in /etc/network/interfaces (on debian an related distributions - others might have a coresponding file somewhere).
2)
The knetworkmanager does only manage devices that are _not_ listed in the interfaces file mentioned above. This is usefull for mobile network devices - like your wlan device.

Both ways to configure network devices work complementary.

If my WLAN hangs, I usually reconnect the device using the knetworkmanager GUI (translation could differ, I run no english system):

Code:

1) Right click the icon 
2) Select "Options" 
3) Select "Change to offline modus" 
Wait until everything is disconnected 
4) Repeat 1 and 2, select "Change to online modus" 
Wait until everything is reocnnected.

Perhaps, you have to select your WLAN manually after changing towards online modus.

Hope this one helps,
Greet-o-mente

This shuts down and restarts network manager.
thanks

pcgeek321 · 09-07-2010, 11:15 AM

ifdown ethX,ifup ethX (X is the interface #)

tito_drum · 03-01-2012, 02:55 PM

Code:

$ ifconfig eth0 down

Code:

$ ifconfig eth0 up

this works for wired connections