#!/bin/sh
INTERVAL=10
PACKETS=1
UDHCPC="udhcpc -i vlan1 -p /var/run/udhcpc.pid -s /tmp/udhcpc"
IFACE=vlan1


ME=`basename $0`
RUNNING=`ps | awk '/'"$ME"'/ {++x}; END {print x+0}'`
if [ "$RUNNING" -gt 3 ]; then
echo "Another instance of \"$ME\" is running"
exit
fi

while sleep $INTERVAL
do
TARGET=`ip route | awk '/default via/ {print $3}'`
RET=`ping -c $PACKETS $TARGET 2> /dev/null | awk '/packets received/ {print $4}'`

if [ "$RET" -ne "$PACKETS" ]; then
echo Ping failed, releasing IP address: $IFACE
#send a RELEASE signal
kill -USR2 `cat /var/run/udhcpc.pid` 2> /dev/null
#ensure udhcpc is not running
killall udhcpc 2> /dev/null
echo Renewing IP address: $IFACE
$UDHCPC
echo Waiting 10 s ...
sleep 10
else
echo Network is up via $TARGET
fi
done

westmen3 napisał/a:

mogą go wkleić do firevall