I've tried to take advntage of the new dial-on-demand routing in pppd, 
but everytime the line gets dropped, pppd reports a "Fatal signal 11" 
error.  This happens whether I wait for my ISP to invoke its 30-minute 
idle timer, or if I set my own shorter timer in the /etc/ppp/options 
file.  The "Fatal signal 11" error occurs _after_ pppd executes my 
ip_down script...

Is anyone else seing this?  Any ideas on how to debug it?