CISC-RT-000236 - 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.

Information

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://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_IOS_Router_Y22M07_STIG.zip

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|III, CCI|CCI-000366, Rule-ID|SV-230038r531386_rule, STIG-ID|CISC-RT-000236, Vuln-ID|V-230038

Plugin: Cisco

Control ID: bcfdababab638e0c595354391e67b0276094a67f223f0f54fe05620f5e6dac31