Consequently, this ARP Probe is a request that may result in a response. The idea is that the person who started the ARP Probe will wait for a response from the original owner if the IP address in question is already in use.
The Opcode field is set to 1, indicating an ARP Request, when it is transmitted. The ARP Probe checks the network to make sure an IP address isn’t in use before polling it. Protocol Size: 6 ARP Reply Payload: Hardware (MAC) Source Address: Opcode: Specifies if the packet is an ARP request or ARP reply.ĪRP Request Payload: Hardware (MAC) Source Address:. It also has the other following attributes : Receiver Protocol address: Specifies the logical address of the target. 
Receiver Hardware Address: Specifies the physical address of the target.įor an ARP Request Packet, this field contains all zeros, because the sender doesn’t know MAC or physical address. Sender Protocol Address: specifies a logical address of the sender, i.e., IPv4 address. Sender Hardware Address: Specifies the physical address of the sender. The payload of the packet contains the following: 
An ARP request packet can be differentiated from an ARP reply packet using the operation field, i.e., opcode in the ARP packet. An ARP packet is either a request packet or a reply packet. Net-Centric Computing in Cloud Computing. Frequency-Hopping Spread Spectrum in Wireless Networks. Top 50 Penetration Testing Interview Questions and Answers. 
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