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The wireless connection in my house unfortunately often disappears, requiring a wireless router reboot.

Making this worse is that my ubuntu media pc, does not automatically reconnect to the wireless network when it's been gone, and then comes up about a minute later. The network in question is setup as "connect automatically" in the network settings.

If I manually select my wireless network, using the wireless icon in the topright of my screen, everything works fine, until the next time that wireless goes down.

I'm looking for a way so I don't have to remember to do this manually all the time.

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I have the exact same problem. I'd be satisfied with a solution that used, e.g. a cron script every 5 minutes asking for Network Manager to reconnect, if it's not connected already. –  Marius Gedminas Sep 11 '10 at 21:57
    
@Marius do you have such a script? –  Oli Sep 12 '10 at 9:21
    
Please add some hardware information to your question. –  Jorge Castro Sep 16 '10 at 17:49
    
@Oli: sadly, no. –  Marius Gedminas Sep 28 '10 at 3:36
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4 Answers

I had a similar problem with my laptop's Intel Wireless WiFi 5100 half height card and the driver iwlagn driver. This problem is a known issue with the iwlagn driver, and the best workaround is to disable 802.11n on the card.

To disable 802.11n on this card create/edit your /etc/modprobe.d/options.conf file sudo gedit /etc/modprobe.d/options.conf And add the following to it.

options iwlagn 11n_disable=1 11n_disable50=1
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This seems to be posted all over the net with no good solutions. I guess the best fix/workaround is to make it check for internet connectivity and if it is not there then reconnect. I did this via a ping test to google.com and then I simply made it restart networking. Code is not tested (the restart part and the cron part, if statement tested), so I'll just wait for it to disconnect at some point. I have an Ubuntu Server 12.10, so no GUI, and is a pain to connect monitor and keyboard every time the wireless stuffs up.

Cron part done via webmin so Idk much about it. Script is as follows:

# edited by dim_voly for networking restart on no pingback every 5 mins

#!/bin/bash
# Name of File: networkingCron
# Purpose: to check if the internet is up (via ping test to google) and if not, restart networking service
# this script is invoked via cron, ideally every 5 mins.

#check if there is internet via ping test
if ! [ "`ping -c 1 google.com`" ]; then #if ping exits nonzero...
   sudo service networking restart #restart the whole thing
   echo Networking service restarted due to no ping response from google.com
fi

echo Script 'networkingCron' completed, if no message above then there was no network restart.

# dunno how to restart the wifi only since that is the only active connection that server uses.

# also I don't think those echos go anywhere

Make sure to run as root and make sure the script has execute (u+x) permissions.

links:

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You might want to have a look at using wpa_supplicant instead of network-manager, but that doesn't really matter when on a media-center. wpa_supplicant isn't as flexible as network-manager but afaik it doesn't give up after trying three times. have a look at this answer.

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Just create a new file vi /root/checkwanup and add this content:

#!/bin/bash

wlan=`/sbin/ifconfig wlan0 | grep inet\ addr | wc -l`

if [ $wlan -eq 0 ]; then

/sbin/ifdown wlan0 && /sbin/ifup wlan0

else

echo interface is up

fi

Then chmod 555 /root/checkwanup and add it to your crontab:

crontab -e
*/15 * * * * /bin/bash /root/checkwanup

Source: http://sirlagz.net/2013/01/10/script-wifi-checker-script/

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