09-Security Configuration Guide

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19-ND attack defense configuration
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19-ND attack defense configuration 34.06 KB

Configuring ND attack defense


Neighbor Discovery (ND) attack defense is able to identify forged ND packets to prevent ND attacks.

The IPv6 ND protocol does not provide any security mechanisms and is vulnerable to network attacks. An attacker can send the forged ICMPv6 messages to perform ND attacks:

·           Forged NS/NA/RS messages with an IPv6 address of a victim host. The gateway and other hosts update the ND entry for the victim with incorrect address information. As a result, all packets intended for the victim are sent to the attacking host.

·           Forged RA packets with the IPv6 address of a victim gateway. As a result, all hosts attached to the victim gateway maintain incorrect IPv6 configuration parameters and ND entries.

For information about the IPv6 ND protocol, see Layer 3IP Services Configuration Guide.

Configuring source MAC consistency check for ND packets

The source MAC consistency check feature is typically configured on gateways to prevent ND attacks.

This feature checks the source MAC address and the link-layer address for consistency for each arriving ND packet.

·           If source MAC address and the link-layer address are not the same, the device drops the packet.

·           If the addresses are the same, the device continues learning ND entries.

The ND logging feature logs source MAC inconsistency events, and it sends the log messages to the information center. You can configure the information center module to set the log output rules. For more information about the information center, see Network Management and Monitoring Configuration Guide.

To configure source MAC consistency check for ND packets:





1.      Enter system view.



2.      Enable source MAC consistency check for ND packets.

ipv6 nd mac-check enable

By default, source MAC consistency check is disabled for ND packets.

3.      (Optional.) Enable the ND logging feature.

ipv6 nd check log enable

By default, the ND logging feature is disabled.

As a best practice, disable the ND logging feature to avoid excessive ND logs.