Gratuitous Arp Settings - D-Link DES-1228/ME User Manual

Gratuitous ARP Settings

This window will show the Gratuitous ARP Settings on the Switch. An ARP announcement (also known as Gratuitous ARP) is a
packet (usually an ARP Request) containing a valid SHA (Sender Hardware Address) and SPA (Sender Protocol Address) for the
host which sent it, with TPA (Target Protocol Address) equal to SPA. Such a request is not intended to solicit a reply, but merely
update the ARP caches of other hosts which receive the packet and determine if there are any IP conflicts.
To view this window click Monitoring > Gratuitous ARP Settings.
Once you have made the desired gratuitous ARP setting changes, click Apply.
To modify a current entry, click the corresponding Modify button of the entry to be modified, revealing the following window to
configure:
The following fields can be set or viewed:
Parameter
Send on IPIF status
up
Send on
Duplicate_IP-
_Detected
Gratuitous ARP
Learning
Gratuitous ARP
Trap & Log
Gratuitous ARP
Periodical Send
DES-1228/ME Layer 2 Fast Ethernet Managed Switch
Figure 11- 24. Gratuitous ARP Settings window
Figure 11- 25. Gratuitous ARP Table – Edit window
Description
This is used to enable/disable the sending of gratuitous ARP request packets while an IPIF
interface comes up. This is used to automatically announce the interface's IP address to other
nodes. By default, the state is Enabled, and only one ARP packet will be broadcast.
This is used to enable/disable the sending of gratuitous ARP request packets while a duplicate
IP is detected. By default, the state is Enabled. 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.
This is used to enable/disable updating ARP cache based on the received gratuitous ARP
packet. If a switch receives a gratuitous ARP packet and the sender's IP address in its ARP
table, it should update the ARP entry. This is Enabled by default.
The switch can trap and log IP conflict events to inform the administrator. By default, trap is
Disabled and event log is Enabled.
This is used to configure the interval for the periodical sending of gratuitous ARP request
packets. By default, the interval is 0.
207