CISC-RT-000150 - The Cisco switch 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:

SW1(config)#no ip gratuitous-arps

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_IOS_Switch_Y24M07_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, CAT|II, CCI|CCI-002385, Rule-ID|SV-220431r856233_rule, STIG-ID|CISC-RT-000150, STIG-Legacy|SV-110709, STIG-Legacy|V-101605, Vuln-ID|V-220431

Plugin: Cisco

Control ID: 26d26a4187788415529d191bcf68cc40e6ef123cdfb2fa5001e17f99f49747d3