Detections
Analytics

CISC-RT-000150 - The Cisco router must be configured to have Gratuitous ARP disabled on all external interfaces.

Information

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.

Solution

Disable gratuitous ARP as shown in the example below:

R5(config)#no ip gratuitous-arps

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_IOS_Router_Y20M07_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, CAT|II, CCI|CCI-002385, Rule-ID|SV-105665r1_rule, STIG-ID|CISC-RT-000150, Vuln-ID|V-96527

Plugin: Cisco

Control ID: d9b837194014df06f02baeebb1816c40ffb9d6f1dd243955163045395c6609e5