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detection entry is aged out, the device generates an alarm and filters out ARP packets sourced from
that MAC address (in filter mode), or only generates an alarm (in monitor mode).
A gateway or critical server may send a large number of ARP packets. To prevent these ARP packets
from being discarded, you can specify the MAC address of the gateway or server as a protected MAC
address. A protected MAC address is excluded from ARP attack detection even if it is an attacker.
Only the ARP packets delivered to the CPU are detected.
Configuration Procedure
Follow these steps to configure source MAC address based ARP attack detection:
To do...
Enter system view
Enable source MAC address
based ARP attack detection
and specify the detection mode
Configure the threshold
Configure the aging timer for
source MAC address based
ARP attack detection entries
Configure protected MAC
addresses
After an ARP attack detection entry expires, the MAC address of the entry becomes ordinary.
Displaying and Maintaining Source MAC Address Based ARP Attack Detection
To do...
Display attacking entries
detected
Configuring ARP Packet Source MAC Address Consistency Check
Introduction
This feature enables a gateway device to filter out ARP packets with the source MAC address in the
Ethernet header different from the sender MAC address in the ARP message, so that the gateway
device can learn correct ARP entries.
Use the command...
system-view
arp anti-attack source-mac
{ filter | monitor }
arp anti-attack source-mac
threshold threshold-value
arp anti-attack source-mac
aging-time time
arp anti-attack source-mac
exclude-mac
mac-address&<1-10>
Use the command...
display arp anti-attack source-mac { slot
slot-number | interface interface-type
interface-number }
1-4
Remarks
—
Required
Disabled by default.
Optional
50 by default.
Optional
Five minutes by default.
Optional
Not configured by default.
Remarks
Available in any
view
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