The Juniper router must be configured to have Gratuitous ARP disabled on all external interfaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-217021 | JUNI-RT-000150 | SV-217021r855889_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 | |||
| Juniper Router RTR Security Technical Implementation Guide | 2024-12-05 | |||
Details
Check Text (C-217021r855889_chk)
Review the configuration to determine if gratuitous ARP is disabled on all external interfaces. The following command should not be set to any interface: gratuitous-arp-reply
If gratuitous ARP is enabled on any external interface, this is a finding.
Fix Text (F-18248r296932_fix)
Disable gratuitous ARP on all external interfaces using the following command.
[edit interfaces ge-1/1/0 ]
delete gratuitous-arp-reply