Have a look at cron and crontab. What you need to do is create a script that you can insert into cron that...

• checks every x minutes if the connection is down.
  
  
  
  • if is not down do nothing.
  
  
  • if it is down reconnect.
  
  

Example of such a script:

#!/bin/bash



IP_ADRESS=192.168.1.1

( ! ping -c1 $IP_ADRESS >/dev/null 2>&1 ) && service network restart >/dev/null 2>&1

Put this in a scrip (set the IP adress to what you want to check), make it executable with

chmod +x /usr/local/bin/check_network

and run the script from crontab. You can edit this line into it with the command crontab -e:

*/2 * * * * root /usr/local/bin/check_network

• */2 makes it check 30 times an hour.