I have an interface (le0) configured as 192.129.84.3.  I then
ifconfig le0 alias 192.129.84.9
...This seems fine.  I can't ping the address .9, but
route add 192.129.84.9 localhost
fixes that.

But now, nearby machines can't ping 192.129.84.3 anymore.
I have to give them
route add 192.129.84.3 gw 192.129.84.9
(the "gw" is because they're Linux.)

Is this a NetBSD bug?  a Linux bug?  A stupid configuration mistake?

-s