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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-90827 JUNI-RT-000150 SV-101037r1_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
Juniper Router RTR Security Technical Implementation Guide 2020-06-04

Details

Check Text ( C-90091r2_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-97135r3_fix)
Disable gratuitous ARP on all external interfaces using the following command.

[edit interfaces ge-1/1/0 ]
delete gratuitous-arp-reply