sos : http://www.cyberciti.biz/faq/crontab-every-10-min/
0 * * * * /bin/ping -c 10 8.8.8.8 || reboot
every hour will ping to check connection
* * * * * /bin/ping -c 10 8.8.8.8 || reboot
every minutes will ping to check connection
* * * * * /bin/ping -q -s 1 -c 60 8.8.8.8 & > /dev/null
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