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Check: JUNI-RT-000150

Juniper Router RTR STIG: JUNI-RT-000150 (in versions v3 r1 through v1 r0.1)

Title

The Juniper router must be configured to have Gratuitous ARP disabled on all external interfaces. (Cat II impact)

Discussion

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.

Check Content

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

Disable gratuitous ARP on all external interfaces using the following command. [edit interfaces ge-1/1/0 ] delete gratuitous-arp-reply

Additional Identifiers

Rule ID: SV-217021r855889_rule

Vulnerability ID: V-217021

Group Title: SRG-NET-000362-RTR-000111

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CCIs

CCIs tied to check.

Number	Definition
CCI-002385	Protect against or limit the effects of organization-defined types of denial-of-service events.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
SC-5	Denial of Service Protection