D-Link DGS-3000 Reference Manual page 382

DGS-3000 Series Layer 2 Managed Gigabit Ethernet Switch CLI Reference Guide
36-2 config gratuitous_arp send dup_ip_detected
Description
This command is used to enable or disable the sending of gratuitous ARP request packets while
the duplicate IP is detected. The duplicate IP detected means that the system received an ARP
request packet that is sent by an IP address that matches the system's own IP address. In this
case, the system knows that some body 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 packet for this duplicate IP address.
Format
config gratuitous_arp send dup_ip_detected [enable | disable]
Parameters
enable - Enables the sending of gratuitous ARP request packet when duplicate IP is detected.
This is the default value.
disable - Disables the sending of gratuitous ARP request packet when duplicate IP is detected.
Restrictions
Only Administrators, Operators and Power-Users can issue this command.
Example
To enable send gratuitous ARP request when duplicate IP is detected:
DGS-3000-26TC:admin#config gratuitous_arp send dup_ip_detected enable
Command: config gratuitous_arp send dup_ip_detected enable
Success.
DGS-3000-26TC:admin#
36-3 config gratuitous_arp learning
Description
This command is used to configure gratuitous ARP learning. Normally, the system only learns the
ARP reply packet or a normal ARP request packet that asks for the MAC address that corresponds
to the system's IP address. This command is used to enable or disable the learning of ARP entry
in the 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 queried for. Note that, 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.
Format
config gratuitous_arp learning [enable | disable]
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