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Check: SRG-NET-000362-RTR-000111

Router SRG: SRG-NET-000362-RTR-000111 (in versions v5 r1 through v4 r1)

Title

The 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. If gratuitous ARP is enabled on any external interface, this is a finding.

Fix Text

Disable gratuitous ARP on all external interfaces.

Additional Identifiers

Rule ID: SV-207151r856635_rule

Vulnerability ID: V-207151

Group Title: SRG-NET-000362

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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