----- Original Message ----- From: "Peter McCarthy" <[EMAIL PROTECTED]> To: "Linux Sydney (E-mail)" <[EMAIL PROTECTED]> Sent: Thursday, February 07, 2002 4:21 PM Subject: [SLUG] backup modem for ADSL
> Howdy > > I would like to configure a modem to be a backup for our rather shaky Telstra > ADSL connection. > the idea being the modem will sit idle until it detects the ADSL is down, then > it will dial up our ISP and give us some connection, humble as it may be. > Naturally the tear down procedure would also occur should the link come back up. I have read this late, since it doesn't seem like anyone replied, this may help. I'm not sure which distro you are using, but on a redhat system, there are two scripts that are executed each time a ppp interface goes up ro down. They are called /etc/ppp/ip-up.local /etc/ppp/ip-down.local. You create them yourself, they are called by /etc/ppp/ip-up and /etc/ppp/ip-down (make sure they are executable "chmod 700") I have a few systems that have been upgraded from Telstra 56K to ADSL. We kept the 56K links and the system dials and connect these modems as they always have (including they set default route) Here are my ip-up.local and ip-down.local scripts................ ===================================== #!/bin/bash # ip-up.local # Detect which interface has just come up # used in conjunction with ip-down.local to switch default route # logger "UP - $*" if [ "$4" = "165.228.222.333" ] ; then echo "ADSL UP `date` - Switching default route to ADSL" > /dev/console echo "ADSL UP `date` - Switching default route to ADSL" >> /var/log/adsl route del default route add default $1 fi ==================================== #!/bin/bash # Detect which interface has just come up # ip-up.local and ip-down.local used to switch default route # This script assumes dialout modem is ppp0 logger "DOWN - $*" if [ "$4" = "165.228.2.118" ] ; then echo "ADSL DOWN `date` - Switching default route to Modem" > /dev/console echo "ADSL DOWN `date` - Switching default route to Modem" >> /var/log/adsl route del default route add default ppp0 fi ===================================== You could add your scripts to dial the modem. perhaps, 1. Delete default route 2. something like (on a Redhat systems) "route del default" "ifup ppp0" regards, Ian -- SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/ More Info: http://lists.slug.org.au/listinfo/slug
