ARP Message Format

• Type: ARP handles many layer 3 and layer 2s

• Protocol Address type: 0x0800 = IP

• Operation: 1= Request, 2=Response

• ARP messages are sent directly to MAC layer

H/W Adr Len

Prot Adr Len

Operation

H/W Address Type

Sender’s h/w address (6 bytes)

Protocol Address Type

Sender’s Prot Address (4 bytes)

Target Protocol Address (4 bytes)

Target h/w address (6 bytes)

0

8

16

24

32

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