Title

The RUCKUS ICX Router must be configured to advertise a hop limit of at least 32 in Router Advertisement messages for IPv6 stateless autoconfiguration deployments. (Cat III impact)

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 (default value = 64). Ipv6 hop-limit xx If it has been configured and has not been set to at least "32", it is a finding.

Fix Text

Configure the router to advertise a hop limit of at least "32" in Router Advertisement messages: ICX(config)#ipv6 hop-limit xx (Decimal between 32 and 255)

Additional Identifiers

Rule ID: SV-273665r1110904_rule

Vulnerability ID: V-273665

Group Title: SRG-NET-000512-RTR-000012

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