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The Cisco switch must be configured to have Gratuitous ARP disabled on all external interfaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-221082 | CISC-RT-000150 | SV-221082r622190_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 |
|---|---|
| Cisco NX-OS Switch RTR Security Technical Implementation Guide | 2021-03-29 |
Details
| Check Text ( C-22797r409735_chk ) |
|---|
| Review the configuration to determine if gratuitous ARP is disabled on all external interfaces as shown in the example below: interface Ethernet2/7 no switchport ip address x.22.4.2/30 no ip arp gratuitous request Note: Gratuitous ARP is enabled on all interfaces by default. If gratuitous ARP is enabled on any external interface, this is a finding. |
| Fix Text (F-22786r409736_fix) |
|---|
| 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 |