#!/bin/sh
IFS=
host_attempt=0
while ( ( /bin/ping -c 1 www.isp.com | grep -q '100% packet loss' ) && \
    [ $host_attempt -lt '3' ] )
do
    host_attempt=`expr $host_attempt + 1`
    /bin/sleep 1
done
if [ $host_attempt = 3 ] ; then
    echo "0x00" > /proc/sys/diag
else
    echo "0x01" > /proc/sys/diag
fi
exit
___________________________________________________________

replace www.isp.com by some website of your provider, or the dns server, or anything that reliably
replies to pinging. Alternatively you can replace the while <> do lines by:
while ((!( /sbin/ifconfig ppp0 | grep -q 'UP' )) && \
    [ $host_attempt -lt '3' ] )
do
which checks whether the ppp0 inteface exists


#!/bin/sh
IFS=host_attempt=0
while ((!( /sbin/ifconfig ppp0 | grep -q 'UP' )) && \
    [ $host_attempt -lt '3' ] )
do
    host_attempt=`expr $host_attempt + 1`
    /bin/sleep 1
done
if [ $host_attempt = 3 ] ; then
    LED="am on wh off"
else
    LED="am off wh off"
fi
	if [ "$LED" != "$PLED" ]; then
	led $LED
	PLED=$LED
	fi
done



#!/bin/sh
I=`nvram get wl0_ifname`
while sleep 1; do
if [ "`wl assoclist`" != "" ]; then
XFER=`ifconfig $I|grep bytes`
if [ "$XFER" != "$PXFER" ]; then
LED="am on wh on"
PXFER=$XFER
else
LED="am on wh of"
fi
else
LED="am of wh of"
fi
if [ "$LED" != "$PLED" ]; then
led $LED
PLED=$LED
fi
done