#!/bin/sh
TESTHOST=4.2.2.4
ping -c 1 -w 5 $TESTHOST &>/dev/null

if [ $? -ne 0 ] ; then
        // IP not reachable -> try if-down-up
        ifdown wan
        ifup wan
        sleep 10
        // Test Again
        ping -c 1 -w 5 4.2.2.4 &>/dev/null
        if [ $? -ne 0 ] ; then
                ifdown wan
        fi
fi