Many times, we see that computers trigger a message when duplicate IP addresses are detected. When a user configures a computer with an IP address, the operating system sends out a gratuitous ARP request on the network. Gratuitous ARP is a layer 1 protocol in the tcp ip model. The gratuitous ARP contains the sender and the target IP address in the ARP Packet as the same value (The IP address which is configured on the computer). The target mac-address is FF-FF-FF-FF-FF-FF (broadcast). If a computer on the network, has the IP address as the same value in the Gratuitous ARP packet, it would send a reply. When the initiator receives the reply, it would signal a duplicate IP address detection on the GUI of the operating system.
No comments:
Post a Comment