the interface pointed to by the default route.
Since the kernel no longer keep routes with dangling address pointer,
netstart(8) has to re-add the default route when the corresponding ifa
has been deleted and re-created.
deraadt@ points out that even if the previous semantic was not necessarily
better, a script like netstart(8) cannot totally fix the default route
problem.
Regression reported by and fix tested by Hrvoje Popovski.
ksh foo checked by halex@