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V-269902

CAT III (Low)

The Dell OS10 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-269902r1052091_rule

STIG

Dell OS10 Switch Router Security Technical Implementation Guide

Version

V1R2

CCIs

CCI-000366

Discussion

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

Verify the ipv6 nd hop-limit settings are not configured less than 32.
 !
 interface ethernet1/1/4
  ...
  ipv6 nd hop-limit 32

If it has been configured and has not been set to at least 32, it is a finding.

Fix Text

Configure each IPv6 interface to advertise a hop limit of at least 32 in Router Advertisement messages as in the example below.

OS10(config)# interface ethernet 1/1/4
OS10(conf-if-eth1/1/4)# ipv6 nd send-ra
OS10(conf-if-eth1/1/4)# ipv6 nd hop-limit 32