Configuring Source Mac Address Based Arp Attack Detection; Introduction; Configuration Procedure - HP 5120 SI Series Security Configuration Manual

Configuring source MAC address based ARP
attack detection

Introduction

This feature allows the switch to check the source MAC address of ARP packets delivered to the CPU. If
the number of ARP packets from a MAC address exceeds the specified threshold within five seconds, the
switch considers this an attack and adds the MAC address to the attack detection table. Before the attack
detection entry is aged out, the switch generates a log message upon receiving an ARP packet sourced
from that MAC address and filters out subsequent ARP packets from that MAC address (in filter mode),
or only generates a log message upon receiving an ARP packet sourced from that MAC address (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.

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 age timer for ARP
attack detection entries
Configure protected MAC
addresses
NOTE:
After an ARP attack detection entry expires, ARP packets sourced from the MAC address in the entry can
be processed normally.
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>
306
Remarks
—
Required
Disabled by default.
Optional
50 by default.
Optional
300 seconds by default.
Optional
No protected MAC address is
configured by default.