What are the functions of gratuitous ARP

Gratuitous ARP means that a host sends an ARP request by using its own IP address as the destination address. Gratuitous ARP provides the following functions:
Checks repeated IP addresses.

Normally, the host should not receive an ARP reply. If the host receives an ARP reply, it indicates that another host is configured with the same IP address.

Declares a new MAC address.

If the host replaces its network card and hence the MAC address changes, the host sends a gratuitous ARP packet to declare the change to all hosts before the aging of ARP entries.

Scroll to top