alaaibrahim / ala-scripts

Holds a collection of my scripts that makes parts of my life easier

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ala-scripts / checkGW
100644 52 lines (47 sloc) 1.095 kb
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#!/bin/bash
 
# Timeout for a ping request from the machine
TIMEOUT=2
# The Array of gateways, the first one has the highest priority
DEFAULTGW=(192.168.1.1 192.168.1.2 192.168.1.3)
# The time between each check
SLEEPTIME=10
 
function switchGW {
    newRoute=$1
    /sbin/ip route change default via $newRoute
}
 
function getDefaultGW {
    /sbin/ip route | grep default | cut -d' ' -f3
}
 
function GWAlive {
    /bin/ping -W $TIMEOUT -c 1 google.com > /dev/null  2>&1
}
while :
do
    GWAlive
    RET=$?
    if [ $RET -ne 0 ]
    then
        echo "`getDefaultGW` is Down"
        # Loop through the gateways
        SUCCESS=0
        for i in ${DEFAULTGW[@]}; do
        	echo "Trying GW $i"
    	switchGW $i
    	GWAlive
    	TEST=$?
    	if [ $TEST -eq 0 ]
    	then
    	    #This One is working
    	    echo "$i seams functioning"
    	    SUCCESS=1
    	    break
    	fi
        done
        if [ $SUCCESS -eq 0 ]
        then
        	echo "All Gateways are down, switching to $DEFAULTGW and waiting for next check"
		    switchGW $DEFAULTGW
        fi
    fi
    sleep $SLEEPTIME
done