☞ 주소 결정 프로토콜 (Address Resolution Protocol) struct ether_arp #include struct ether_arp { struct arphdr ea_hdr; /* fixed-size header */ u_int8_t arp_sha[ETH_ALEN]; /* sender hardware address */ u_int8_t arp_spa[4]; /* sender protocol address */ u_int8_t arp_tha[ETH_ALEN]; /* target hardware address */ u_int8_t arp_tpa[4]; /* target protocol address */ }; struct arphdr #include struct arphdr { unsi..