Ubuntu – Network manager wireless connection duplicated

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:

• https://help.ubuntu.com/community/CronHowto
• Ping Test (StackOverflow)
• Echo Output

Here is an Upstart script you can place to /etc/init/reconnect.conf:

start on started network-manager
stop on runlevel [016]

script
  while true; do
    if ifconfig eth0 | grep -q "inet addr:"; then
       # echo "all ok!"
    else
       restart network-manager
    fi
    sleep 5
  done
end script

Upon losing an ip address for eth0 (configure to your interface if its different), it will restart network-manager job and restore connectivity.