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The router must be configured to have Gratuitous ARP disabled on all external interfaces.


Overview

Finding ID Version Rule ID IA Controls Severity
V-207151 SRG-NET-000362-RTR-000111 SV-207151r604135_rule Medium
Description
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.
STIG Date
Router Security Requirements Guide 2021-03-16

Details

Check Text ( C-7412r382436_chk )
Review the configuration to determine if gratuitous ARP is disabled on all external interfaces.

If gratuitous ARP is enabled on any external interface, this is a finding.
Fix Text (F-7412r382437_fix)
Disable gratuitous ARP on all external interfaces.