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The router must be configured to have Gratuitous ARP disabled on all external interfaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-78219 | SRG-NET-000362-RTR-000111 | SV-92925r1_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 |
|---|---|
| Router Security Requirements Guide | 2019-09-27 |
Details
| Check Text ( C-77775r1_chk ) |
|---|
| 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 (F-84947r1_fix) |
|---|
| Disable gratuitous ARP on all external interfaces. |