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Appendix C     Packet Header Formats
Different fields in the ARP packet header are described in Table C 4.
Table C 4 ARP Packet Header Fields
Field
Explanation
HW Address Type
The HW Address type is a 16 bit long field and it shows the type of hard 
ware. Since most of LANs are Ethernet based, its value is 1. For IEEE 802 
networks, its value is 6. For IPSec tunnel, the value is 31.
Protocol Address Type
The protocol address type shows the protocol used in the network layer. 
The value of this field is 0x800 for IP.
HW Addr Len
This field shows the length of the hardware address in number of bytes. 
This field is 8 bits long.
Proto Addr Length
This field shows the length of the protocol address. This field is also 8 bits 
long.
Operation or Opcode
This field is 16 bits long and is used for the type of ARP packet. A value 
of 1 indicates a request packet and a value of 2 indicates a reply packet.
Source hardware address
This is a 48 bit long field in the case of Ethernet. However its length is 
variable.
Source protocol address
This is a 32 bit field in the case of IPv4 packets. However its length is vari 
able.
Target hardware address
This is 48 bits long in  Ethernet and its length is variable.
Target protocol address
This is 32 bits in the case of IPv4 and its length is variable.






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