I configured ISDN with isdn-config and set dialmode to auto.
My ISP assigns dynamic IPs -> $REMOTE_IP is left empty.
This results in the following messages when I execute /etc/rc.d/init.d/isdn
start:
 + route add default gw
Benutzung: inet_route [-vF] del {-host|-net} Ziel[/prefix] [gw Gw] [metric
M]
+[[dev] If]
        inet_route [-vF] add {-host|-net} Ziel[/Prefix] [gw Gw] [metric M]
                               [netmask N] [mss Mss] [window W] [irtt I]
                               [mod] [dyn] [reinstate] [[dev] If]
        inet_route [-vF] add {-host|-net} Ziel[/Prdfix] [metric M] reject
        inet_route [-FC] flush      NICHT unterst|tzt
 + [  = 1 ]

(I edited the startup script and added a 'set -x')

After isdn startup the defaultroute to the isdn interface was missing.


Fix:   Assign a dummy-IP to REMOTE_IP which will be overwritten when a
connection is established.