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V-207151

CAT II (Medium)

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

Rule ID

SV-207151r856635_rule

STIG

Router Security Requirements Guide

Version

V5R2

CCIs

CCI-002385

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.

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

Fix Text

Disable gratuitous ARP on all external interfaces.