check_lan.sh

#!/bin/sh

# cron script for checking wlan connectivity
# change 192.168.1.1 to whatever IP you want to check.
IP_FOR_TEST="192.168.1.1"
PING_COUNT=1

PING="/bin/ping"
IFUP="/sbin/ifup"
IFDOWN="/sbin/ifdown --force"

INTERFACE="eth0"

FFLAG="/opt/check_lan/stuck.fflg"

# ping test
$PING -c $PING_COUNT $IP_FOR_TEST > /dev/null 2> /dev/null
if [ $? -ge 1 ]
then
  logger "$INTERFACE seems to be down, trying to bring it up..."
		if [ -e $FFLAG ]
		then
				logger "$INTERFACE is still down, REBOOT to recover ..."
				rm -f $FFLAG 2>/dev/null
				sudo reboot
		else
				touch $FFLAG
				logger $(sudo $IFDOWN $INTERFACE)
				sleep 10
				logger $(sudo $IFUP $INTERFACE)
		fi
else
#    logger "$INTERFACE is up"
	rm -f $FFLAG 2>/dev/null
fi