+ struct ether_addr *dst_mac, uint16_t ether_type,
+ uint8_t vlan_enabled, uint16_t van_id);
+
+void
+initialize_arp_header(struct arp_hdr *arp_hdr, struct ether_addr *src_mac,
+ struct ether_addr *dst_mac, uint32_t src_ip, uint32_t dst_ip,
+ uint32_t opcode);