Tool

This script discovers if the network is down and the output is logged & emailed to <root>.

1. Copy script to /usr/local/sbin/ping_network
2. chmod 744 /usr/local/sbin/ping_network
3. crontab -e
   * * * * 1-5 /usr/local/sbin/ping_network
4. edit HOSTS
   

   #!/bin/sh
   # By Mr. Sontaya  Photibut
   # website http://www.susethailand.com
   # GPL License
   # 27/06/2008
   HOSTS=" 192.168.0.1 192.168.11.1 192.168.12.1 192.168.13.1 192.168.15.1 192.168.16.1 192.168.17.1 192.168.18.1 192.168.19.1 192.168.20.1 192.168.22.1 "
   
   for HOST in $HOSTS
   do
       ping -c1 -w1 $HOST > /dev/null
   
       if [ $? -ne 0 ]
               then
                   logger "ping: $HOST DOWN"
                   echo -n "$HOST DOWN on " && date +%d/%m/%Y-%H:%M:%S
       else
                   logger "ping: $HOST UP"
       fi
   
   done
                 
   exit 0<