V-254032

Discussion

A gratuitous ARP is an ARP broadcast in which the source and destination MAC addresses are the same. It is used to inform the network about a host IP address. A spoofed gratuitous ARP message can cause network mapping information to be stored incorrectly, causing network malfunction.

Check Content

Review the configuration to determine if gratuitous ARP is disabled on all external interfaces.
[edit interfaces]
<external interface> {
    no-gratuitous-arp-reply;
    no-gratuitous-arp-request;
    unit <number> {
        family inet {
            address <IPv4 address>/<mask>;
        }
        family inet6 {
            address <IPv6 address>/<mask>;
        }
    }
}

If gratuitous ARP is enabled on any external interface, this is a finding.