in nd6_is_addr_neighbor, regarded every address as on-link when the default router list is empty.  otherwise, we'd not be able make a neighbor cache for the address. this algorithm is applied to hosts only.
in nd6_is_addr_neighbor, regarded every address as on-link when the
default router list is empty.  otherwise, we'd not be able make a neighbor
cache for the address.
this algorithm is applied to hosts only.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame