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The Juniper router must be configured to have Gratuitous ARP disabled on all external interfaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-217021 | JUNI-RT-000150 | SV-217021r639663_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 |
|---|---|
| Juniper Router RTR Security Technical Implementation Guide | 2021-02-11 |
Details
| Check Text ( C-18250r296931_chk ) |
|---|
| Review the configuration to determine if gratuitous ARP is disabled on all external interfaces. The following command should not be set to any interface: gratuitous-arp-reply If gratuitous ARP is enabled on any external interface, this is a finding. |
| Fix Text (F-18248r296932_fix) |
|---|
| Disable gratuitous ARP on all external interfaces using the following command. [edit interfaces ge-1/1/0 ] delete gratuitous-arp-reply |