The /sbin/ifup script contains this line to detect whether
an interface works:
/sbin/ifconfig ${REALDEVICE} 2>&1 | grep -s "unknown
interface" > /dev/null

The current version of ifconfig doesn't return a line with
"unknown interface" in it if an interface fails to
initialise, so this isn't very helpful.

------- Email Received From  "Ganesh Sittampalam,Computing Laboratory,83512,86765" <ganesh.sittampalam.ac.uk> 04/08/99 21:30 -------