I recently ran into a problem where I was trying to define an IP and 
aliases to an interface through rc.conf.
ifconfig_fxp0 "inet a.b.c.d netmask 0xffffff00"
ifconfig_fxp0 "inet e.f.g.h netmask 0xffffffff alias"
 It seemed that each definition over wrote the last.  I've ended up 
defining the interfaces IP's through ifconfig.if, but was wondering if 
it is possible to do so through rc.conf?
--
Bryan Buecking