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.

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Disable Gratuitous ARP as shown in the example below:

SW1(config)# int e2/7
SW1(config-if)# no ip arp gratuitous request
SW1(config-if)# end

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_NX-OS_Switch_Y24M07_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, CAT|II, CCI|CCI-002385, Rule-ID|SV-221082r999691_rule, STIG-ID|CISC-RT-000150, STIG-Legacy|SV-110983, STIG-Legacy|V-101879, Vuln-ID|V-221082

Plugin: Cisco

Control ID: 06faf6c1c1d4c8a0514a2e947703849488c45d2b2bd9c6ab176087a1b4bcf7b8