arp_nce_init
nce = arp_nce_init(dst_ill, ipha->ipha_dst, IRE_BROADCAST);
nce = arp_nce_init(nexthop->ire_ill, nexthop->ire_addr,
nce = arp_nce_init(ire->ire_ill, v4nexthop,
nce = arp_nce_init(ill, dst, ill->ill_net_type);
nce = arp_nce_init(ill, dst, IRE_MULTICAST);
nce1 = arp_nce_init(ire1->ire_ill, ire1->ire_addr,
nce1 = arp_nce_init(ill1, nexthop, ire_type);
extern struct nce_s *arp_nce_init(ill_t *, in_addr_t, int);