s->dadtransmits : os->dadtransmits;
n->multicast_to_unicast = s->multicast_to_unicast;
n->multicast_router = s->multicast_router;
s->dadtransmits : os->dadtransmits;
n->multicast_to_unicast = s->multicast_to_unicast;
n->multicast_router = s->multicast_router;