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- Table of Contents
-
- 10-Security
- 00-Preface
- 01-AAA configuration
- 02-802.1X configuration
- 03-802.1X client configuration
- 04-MAC authentication configuration
- 05-Portal configuration
- 06-User profile configuration
- 07-Password control configuration
- 08-Public key management
- 09-PKI configuration
- 10-IPsec configuration
- 11-SSH configuration
- 12-SSL configuration
- 13-Session management
- 14-Connection limit configuration
- 15-Attack detection and prevention configuration
- 16-IP source guard configuration
- 17-ARP attack protection configuration
- 18-ND attack defense configuration
- 19-User isolation configuration
- 20-ASPF configuration
- Related Documents
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| Title | Size | Download |
|---|---|---|
| 18-ND attack defense configuration | 35.40 KB |
Configuring ND attack defense
Overview
IPv6 Neighbor Discovery (ND) attack defense is able to identify forged ND messages 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 following 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 messages 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 3–IP Services Configuration Guide.
Configuring source MAC consistency check for ND messages
The source MAC consistency check feature is typically configured on gateways to prevent ND attacks.
This feature checks the source MAC address and the source link-layer address for consistency for each arriving ND message.
· If the source MAC address and the source 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. The information center can then output log messages from different source modules to different destinations. For more information about the information center, see Network Management and Monitoring Configuration Guide.
To configure source MAC consistency check for ND messages:
|
Step |
Command |
Remarks |
|
1. Enter system view. |
system-view |
N/A |
|
2. Enable source MAC consistency check for ND messages. |
ipv6 nd mac-check enable |
By default, source MAC consistency check is disabled for ND messages. |
|
3. (Optional.) Enable the ND logging feature. |
ipv6 nd check log enable |
By default, the ND logging feature is disabled. H3C recommends that you disable the ND logging feature to avoid excessive ND logs. |
