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- Table of Contents
-
- 14-Security Configuration Guide
- 00-Preface
- 01-ACL configuration
- 02-Time range configuration
- 03-User profile configuration
- 04-Public key management
- 05-PKI configuration
- 06-IPsec configuration
- 07-SSH configuration
- 08-SSL configuration
- 09-Session management
- 10-ARP attack protection configuration
- 11-ND attack defense configuration
- 12-Password control configuration
- 13-Crypto engine configuration
- 14-Connection limit configuration
- Related Documents
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| Title | Size | Download |
|---|---|---|
| 11-ND attack defense configuration | 51.31 KB |
Configuring ND attack defense
About ND attack defense
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. As shown in Figure 1, 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 terminal.
· 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.
Enabling source MAC consistency check for ND messages
About this task
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 System Management Configuration Guide.
Procedure
1. Enter system view.
system-view
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.
As a best practice, disable the ND logging feature to avoid excessive ND logs.
