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apt-get install fping

#!/bin/bash

PIDFILE=/var/run/testcon.pid

. /lib/lsb/init-functions

case "$1" in
  start)
        log_daemon_msg "Starting internet connection tester"
        /etc/init.d/testcond &
        echo $! > $PIDFILE
        log_end_msg $?
    ;;
  stop)
        log_daemon_msg "Stopping internet connection tester"
        PID=$(cat $PIDFILE)
        kill -9 "$PID"
        log_end_msg $?
    ;;
  *)
    echo "Usage: /etc/init.d/testcon {start|stop}"
    exit 1
    ;;
esac

exit 0

#echo Computer starting or testing daemon init
while [ "$itest" == "" ] 
do
    #wait 5 seconds 
    sleep 5
    itest=$(fping 8.8.8.8 | grep alive)
done
date | mail -s "Server is up and Internet is online" your_email@gmail.com

#loop forever
while [ "1" == "1" ] 
do
    itest=$(fping 8.8.8.8 | grep alive)
    #if internet is down
    if [ "$itest" == "" ] 
    then
        #echo Internet is down
        #log time it was found down
        current_time=$(date)
        echo "Internet was found down @ $current_time" >> /mnt/data/Server/internet_log.txt
        #loop until it is back
        while [ "$itest" == "" ] 
        do
            #wait 60 seconds 
            sleep 60
            itest=$(fping 8.8.8.8 | grep alive) # test the internet
        done
        #when it is back
        current_time=$(date)
        echo "Internet is back        @ $current_time" >> /mnt/data/Server/internet_log.txt
        body=$(tail -2 /mnt/data/Server/internet_log.txt)
        echo "$body" | mail -s "Internet is back online" your_email@gmail.com
    fi
    #echo Internet is online
    #wait 60 seconds
    sleep 60
        done

sudo update-rc.d testcon defaults
sudo update-rc.d testcon enable