Gratuitous Arp; Gratuitous Arp Global Settings; Gratuitous Arp Settings - D-Link DGS-3120-24TC Product Manual

xStack® DGS-3120 Series Managed Switch Web UI Reference Guide

Gratuitous ARP

Gratuitous ARP Global Settings

The user can enable or disable the gratuitous ARP global settings here.
To view the following window, click Management > Gratuitous ARP > Gratuitous ARP Global Settings, as show
below:
The fields that can be configured are described below:
Parameter
Send On IP Interface
Status Up
Send On Duplicate IP
Detected
Gratuitous ARP
Learning
Click the Apply button to accept the changes made.
NOTE: With the gratuitous ARP learning, the system will not learn new entry but only do the update on
the ARP table based on the received gratuitous ARP packet.

Gratuitous ARP Settings

The user can configure the IP interface's gratuitous ARP parameter.
To view the following window, click Management > Gratuitous ARP > Gratuitous ARP Settings, as show below:
Figure 3–4 Gratuitous ARP Global Settings Window
Description
The command is used to enable/disable sending of gratuitous ARP request packet
while the IPIF interface become up. This is used to automatically announce the
interface's IP address to other nodes. By default, the state is disabled, and only one
gratuitous ARP packet will be broadcast.
The command is used to enable/disable the sending of gratuitous ARP request
packet while a duplicate IP is detected. By default, the state is disabled. For this
command, the duplicate IP detected means that the system received an ARP request
packet that is sent by an IP address that match the system's own IP address. In this
case, the system knows that somebody out there uses an IP address that is conflict
with the system. In order to reclaim the correct host of this IP address, the system can
send out the gratuitous ARP request packets for this duplicate IP address.
Normally, the system will only learn the ARP reply packet or a normal ARP request
packet that asks for the MAC address that corresponds to the system's IP address.
The command is used to enable/disable learning of ARP entry in ARP cache based
on the received gratuitous ARP packet. The gratuitous ARP packet is sent by a
source IP address that is identical to the IP that the packet is queries for. By default,
the state is Disabled status.
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