D-Link DGS-1510 User Manual - Page 190

DGS-1510 Series Gigabit Ethernet SmartPro Switch Web UI Reference Guide Gratuitous ARP This window is used to view and configure the gratuitous ARP settings. A gratuitous ARP request packet is an ARP request packet where the source and the destination IP address are both set to the IP address of the sending device and the destination MAC address is the broadcast address. Generally, a device use the gratuitous ARP request packet to discover whether the IP address is duplicated by other hosts or to preload or reconfigure the ARP cache entry of hosts connected to the interface. To view the following window, click L3 Features > Gratuitous ARP, as shown below: Figure 6-5 Gratuitous ARP Window The fields that can be configured are described below: Parameter Description IP Gratuitous ARP State Select option to enable or disable the transmission of gratuitous ARP request packets. Gratuitous ARP Trap State Select this option to enable or disable the ARP trap state. IP Gratuitous ARP Dad-Reply Select this option to enable or disable the IP gratuitous ARP Dad- State reply state. Gratuitous ARP Learning State Select this option to enable or disable the gratuitous ARP learning state. 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. This option used to enable or disable the learning of ARP entries 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 queries for. Click the Apply button to accept the changes made. Click the Edit button to re-configure the specific entry. Enter a page number and click the Go button to navigate to a specific page when multiple pages exist. 179