Operation Manual – ARPH3C S3100 Series Ethernet Switches Chapter 1 ARP Configuration1-2Hardware type (16 bits)Protocol type (16 bits)Length of hardware address Length of protocol addressOperator (16 bits)Hardware address of the senderIP address of the senderHardware address of the receiverIP address of the receiverHardware type (16 bits)Hardware type (16 bits)Protocol type (16 bits)Length of hardware address Length of protocol addressOperator (16 bits)Hardware address of the senderIP address of the senderHardware address of the receiverIP address of the receiverFigure 1-1 ARP message formatTable 1-1 describes the fields of an ARP packet.Table 1-1 Description on the fields of an ARP packetField DescriptionHardware Type Type of the hardware interface. Refer to Table1-2 for the information about the field values.Protocol type Type of protocol address to be mapped.0x0800 indicates an IP address.Length of hardware address Hardware address length (in bytes)Length of protocol address Protocol address length (in bytes)OperatorIndicates the type of a data packets, whichcan be:z 1: ARP request packetsz 2: ARP reply packetsz 3: RARP request packetsz 4: RARP reply packetsHardware address of the sender Hardware address of the senderIP address of the sender IP address of the senderHardware address of the receiverz For an ARP request packet, this field isnull.z For an ARP reply packet, this field carriesthe hardware address of the receiver.IP address of the receiver IP address of the receiver
