>> # ifconfig ex0 10.100.0.1/30
>> # ifconfig ex0 10.100.0.100/24 alias

>> Note in particular the lack of a route to 10.100/24 corresponding to
>> the "alias" address.

> if you delete the first address (the /30), the route for /24
> "reappears".  may be a bug in netstat?

That actually makes sense.

I just tried some experiments with all the addresses being aliases, to
avoid issues with the way an alias gets promoted to primary if the
primary address is deleted:

# ifconfig ne2 10.100.1.1/24

That address remained primary throughout the experiments.

If I add 10.100.0.1/30 and then 10.100.0.100/24, netstat shows me a
route to the /30.  But if I add them in the other order, it shows me
the route to the /24 and fails to show the route to the /30.

I now suspect both routes are actually present, and the problem is some
kind of confusion in netstat over two routes with "the same
destination" (10.100.0.0).  Someday if I get the leisure I may dig into
the code and see if I can figure out what's up.

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