Hi all the list,
I am happy to tell you that I have the solution for this recurent problem.
Many thanks for all of you, and for Jacques who has sent me a very intersting script.
Jacques has explained me how to play with 'cron' to launch this script every minute.
Sorry for the cuting at each end of line, due to my mailer editor...
I believe that you will correct this for your usage.
#!/bin/sh
#
# Check a regular interval defined in /etc/crontab that IP exists for IFACE
# and that IP has not changed
# this is obtained by scanning "ip addr show $IFACE" return (function getip()).
# If IFACE is down or IP has changed, then a script can be executed.
# Return to correct defaultroute if IPSEc user lost ISP link.
# Adapted by J. Nilo from a script by T. Nkaoua
# Defaultroute switching survey feature added by F6HQZ Francois BERGERET
# (tks to J.Nilo and T.Nkaoua)
IFACE=ppp0
FILE=/tmp/checkip
getip() {
IP=`ip addr show $IFACE | grep inet | cut -f1 -d"p" | cut -f2 -d"t" | cut -f1
-d"/"`
}
getgate() {
GATE=`ip addr show $IFACE | grep inet | cut -f1 -d"/" | cut -f2 -d"r" | cut
-f1 -d"/"`
}
getdefroute() {
DEFROUTE=`ip route | grep default | cut -f3 -d"v"`
}
if [ -f $FILE ]; then
read OLDIP < $FILE
else
getip
echo $IP > $FILE
exit
fi
getip
echo $IP > $FILE
getgate
getdefroute
if ! [ "$IP" ]; then
logger "checkip: Checkip connection broken detection"
#
# Put any command here that you want to activate if IFACE is down
#
exit
fi
if [ $DEFROUTE != $IFACE ]; then
logger checkip: IP:$IP GATE:$GATE DEFAULTROUTE:$DEFROUTE
logger checkip: WARNING: defaultroute was $DEFROUTE
logger checkip: ip route del default
logger checkip: ip route add default via $GATE dev $IFACE
ip route del default
ip route add default via $GATE dev $IFACE
exit
fi
if [ $OLDIP != $IP ]; then
logger checkip: IP has changed for $IFACE: new IP is $IP - old IP was $OLDIP
#
# Put any command here that you want to activate if IP has changed
#
logger checkip: ip route del default
logger checkip: ip route add default via $GATE dev $IFACE
ip route del default
ip route add default via $GATE dev $IFACE
fi
#------------------------ FILE END -----------------------------------
Instructions to install checkip.dat :
Copy this file to :
/usr/sbin/checkip.dat
chmod 755 checkip.dat
Edit /etc/cron.d/multicron and add a new line :
*/1 * * * * root /usr/sbin/checkip.dat
Backup root.lrp
And enjoy with Bering running 24/24 without any interruption due to ISP link cutted !
Best Regards,
Francois BERGERET,
France.
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