The 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-220146	SRG-NET-000512-RTR-000014	SV-220146r604135_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
Router Security Requirements Guide	2021-03-16

Details

Check Text ( C-21861r457765_chk )
This requirement is not applicable for the DODIN Backbone. Review the router configuration to verify Router Advertisements are suppressed on all external IPv6-enabled interfaces. If the router is not configured to suppress Router Advertisements on all external IPv6-enabled interfaces, this is a finding.

Fix Text (F-21853r457766_fix)
Configure the router to suppress Router Advertisements on all external IPv6-enabled interfaces.