#!/bin/sh



# monitorscript.sh - monitor the network



PATH=/bin:/usr/bin:/usr/local/bin

export PATH



# your _own_ IP addr or hostname

hostn="linuxbox.your.supercomputer"



if ping -w 5 -qn -c 1 $hostn > /dev/null ; then

    # ok host is up

    echo "0" > /etc/pingfail

else

    # no answer count up the ping failures

    if [ -r /etc/pingfail ] then

        pingfail=`cat /etc/pingfail`

    else

        # we do not handle the case where the

        # pingfail file is missing

        exit 0

    fi

    pingfail=`expr "$pingfail" "+" 1`

    echo "$pingfail ping failures"

    echo "$pingfail" > /etc/pingfail

    if [ $pingfail -gt 10 ] then

        echo "More than 10 ping failures. System reboot..."

        /sbin/shutdown -t2 -r now

    fi

fi



# end of monitor script

1,15,30,45 * * * * /path_to_the_script/monitorscript.sh