ARPOP_REPLY
if (ah->arp_op != htons(ARPOP_REPLY)) {
arp->arp_op = htons(ARPOP_REPLY);
case ARPOP_REPLY:
if (op == ARPOP_REPLY) {
ah->ar_op = htons(ARPOP_REPLY);
case ARPOP_REPLY:
case ARPOP_REPLY:
ah->ar_op = htons(ARPOP_REPLY);
if (op == ARPOP_REPLY)