ARP

ARP REQUEST:

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Following screen shot shows the Wireshark capture window of ARP Request message. You must compare the below screen shot with ARP message format image at the beginning of this lesson. We can see from the below screen shot that the Destination MAC Address is FF:FF:FF:FF:FF:FF (Broadcast MAC Address), ARP opcode is 1 (for ARP Request), and the Target MAC Address is 00:00:00:00:00:00, which is unknown at this instance.

We can also see from the below screen shot that the Source IP Address is 192.168.0.84, Destination IP Address is 192.168.0.122, Source MAC Address 08:00:27:58:58:98 and Destination MAC Address is 00:00:00:00:00:00.

ARP REPLY:

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The "Sender MAC Address" field (which is marked below) in ARP Reply is the answer for ARP Request.