gratuitous ARP: An Address Resolution Protocol (ARP) Request frame sent by a host for the host's own Internet Protocol version 4 (IPv4) address when the TCP/IP protocol obtains addressing information. Gratuitous ARPs are used to check for duplicate IPv4 addresses on the subnet. If the host receives a reply to the gratuitous ARP request from another host or computer, it detects a conflict for its configured IPv4 address and will not use it.
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