CISC-RT-000236 - The Cisco switch must be configured to advertise a hop limit of at least 32 in Switch 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.

NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.

Solution

Configure the switch to advertise a hop limit of at least 32 in Router Advertisement messages as shown in the example.

SW1(config)# interface e2/1 - 2
SW1(config-if-range)# ipv6 nd hop-limit 32
SW1(config-if-range)# end

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_NX-OS_Switch_Y21M10_STIG.zip

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|III, CCI|CCI-000366, Rule-ID|SV-237754r648783_rule, STIG-ID|CISC-RT-000236, Vuln-ID|V-237754

Plugin: Cisco

Control ID: 31ce82a69f9b6fc91cae67dbedc4bc57719bc6fed1c09c3d94c588ff0383e58a