ar_tha
bzero(ar_tha(ah), ETHER_ADDR_LEN);
memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
memcpy(dst.octet, ar_tha(ah), ETHER_ADDR_LEN);
u_char ar_tha[]; /* target hardware address */
*destfw = *(struct fw_hwaddr *) ar_tha(ah);
bcopy(ar_tha(ah), ar_tpa(ah), ah->ar_pln);
(void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
(void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
(void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
ereq.lladdr = ar_tha(ah);