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-207151r856635_rule | CCI-002385 | 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 | 2024-05-28 | |||
Details
Check Text (C-207151r856635_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.