When an IP interface is configured using ifconfig, I
see that a 
INADDR_ALLHOSTS_GROUP address gets attached to that
interface:

ini_ifinit() in netinet/in.c
if (ifp->if_flags & IFF_MULTICAST) {
	struct in_addr addr;
	addr.s_addr = INADDR_ALLHOSTS_GROUP;
	in_addmulti(&addr, ifp);
}

But I dont see associated in_delmulti() when an
interface is deleted - "ifconfig de0 delete"
(Should that have been added to in_purgeaddr()?)

I have turned on the IFAREF_DEBUG option and see a
refcount going from 2 to 1 and thats it. No 
ifafree is called.


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