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V-283849

CAT III (Low)

The Nokia router must be configured to advertise a hop limit of at least 32 in Router Advertisement messages for IPv6 stateless auto-configuration deployments.

Rule ID

SV-283849r1203796_rule

STIG

Nokia Service Router OS 25.x Router Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000366

Discussion

The Neighbor Discovery protocol allows routers to advertise a hop limit value, instead of the standardized default value, in a Router Advertisement message being used by hosts. If a very small value was configured and advertised to hosts on the local area network (LAN) segment, communications would fail due to the hop limit reaching zero before the packets sent by a host reached their destination.

Check Content

This requirement is not applicable for the DODIN Backbone. 

Review the router configuration to determine if the hop limit has been configured for Router Advertisement messages, as shown in the example below: 

- show router rtr-advertisement | match "Hop Limit"
Retransmit Time      : 00h00m00s0ms     Hop Limit            : 32

If the hop limit has been configured and has not been set to at least 32, this is a finding.

Fix Text

Configure the router to advertise a hop limit of at least 32 in Router Advertisement messages, as shown in the example below: 

- configure router router-advertisement interface "TO-PE2" current-hop-limit 32