The Arista perimeter router must be configured to suppress Router Advertisements on all external IPv6-enabled interfaces.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-256059	ARST-RT-000800	SV-256059r882519_rule		Medium

Description
Many of the known attacks in stateless autoconfiguration are defined in RFC 3756 were present in IPv4 ARP attacks. To mitigate these vulnerabilities, links that have no hosts connected such as the interface connecting to external gateways must be configured to suppress router advertisements.

STIG	Date
Arista MLS EOS 4.2x Router Security Technical Implementation Guide	2023-01-17

Details

Check Text ( C-59735r882517_chk )
This requirement is not applicable for the DODIN backbone. Review the Arista router configuration to verify Router Advertisements are suppressed on all external IPv6-enabled interfaces. interface vlan 200 ipv6 nd ra disabled all If the Arista router is not configured to suppress Router Advertisements on all external IPv6-enabled interfaces, this is a finding.

Fix Text (F-59678r882518_fix)
This requirement is not applicable for the DODIN backbone. Configure the Arista router to suppress Router Advertisements on all external IPv6-enabled interfaces. Configure the Arista router to suppress RAs on all IPv6 enabled interface as in the following example for VLAN 200: router(config)#interface vlan 200 router(config-vl200)#ipv6 nd ra disabled all router(config-vl200)#