V-283876

Discussion

Many of the known attacks in stateless autoconfiguration are defined in RFC 3756 and were present in IPv4 ARP attacks. To mitigate these vulnerabilities, links that have no hosts connected, such as the interface connecting to external gateways, must be configured to suppress Router Advertisements.

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This requirement is not applicable for the DODIN Backbone. 

Review the router configuration to verify Router Advertisements are suppressed on all external IPv6-enabled interfaces.

Use the command below and verify for each interface the "RtrAdvertisement Tx" value:

- show router rtr-advertisement

Router Advertisement

Interface: TO-PE2
-------------------------------------------------------------------------------
Rtr Advertisement Tx : 4                Last Sent            : 00h05m01s
Nbr Solicitation Tx  : 3097             Last Sent            : 00h00m53s
Nbr Advertisement Tx : 3078             Last Sent            : 00h00m53s
Rtr Advertisement Rx : 0                Rtr Solicitation Rx  : 0
Nbr Advertisement Rx : 3095             Nbr Solicitation Rx  : 3078
-------------------------------------------------------------------------------
Max Advert Interval  : 600              Min Advert Interval  : 200
Managed Config       : FALSE            Other Config         : FALSE
Reachable Time       : 00h00m00s0ms     Router Lifetime      : 00h30m00s
Retransmit Time      : 00h00m00s0ms     Hop Limit            : 64
Link MTU             : 0                ND Router Preference : medium
MAC Addr To Use      : Interface
Creation Origin      : manual
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If the router is not configured to suppress Router Advertisements on all external IPv6-enabled interfaces, this is a finding.