Detections
Analytics

1.15 CISC-RT-000236

Information

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

GROUP ID: V-230040RULE ID: SV-230040r532994

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.

Solution

Configure the router to advertise a hop limit of at least 32 in Router Advertisement messages.

R1(config)#ipv6 hop-limit 128

See Also

https://workbench.cisecurity.org/benchmarks/23599

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|III, CCI|CCI-000366, Rule-ID|SV-230040r532994_rule, STIG-ID|CISC-RT-000236, Vuln-ID|V-230040

Plugin: Cisco

Control ID: 9094a4b4fa0dd61a309ea7c953b230fd889e43e745d9202fc8f96ef2911e2290