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. ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ------------------------------------------------------------------------ leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html