Configuring Arp Active Acknowledgement; Configuring Arp Detection; Configuring The Arp Active Acknowledgement Function - HP 4800G Series Configuration Manual

Configuration Procedure
Follow these steps to enable ARP packet source MAC address consistency check:
To do...
Enter system view
Enable ARP packet source MAC
address consistency check

Configuring ARP Active Acknowledgement

Introduction
Typically, the ARP active acknowledgement feature is configured on gateway devices to identify invalid
ARP packets.
With this feature enabled, the gateway, upon receiving an ARP packet with a different source MAC
address from that in the corresponding ARP entry, checks whether the ARP entry has been updated
within the last minute:
If yes, the gateway does not update the ARP entry;
If not, the gateway unicasts an ARP request to the source MAC address of the ARP entry.
Then,
If an ARP reply is received within five seconds, the ARP packet is ignored;
If not, the gateway unicasts an ARP request to the MAC address of the ARP packet.
Then,
If an ARP reply is received within five seconds, the gateway updates the ARP entry;
If not, the ARP entry is not updated.

Configuring the ARP Active Acknowledgement Function

Follow these steps to configure ARP active acknowledgement:
To do...
Enter system view
Enable the ARP active
acknowledgement function

Configuring ARP Detection

Use the command...
system-view
arp anti-attack valid-check
enable
Use the command...
system-view
arp anti-attack active-ack enable
1-5
Remarks
—
Required
Disabled by default.
Remarks
—
Required
Disabled by default.