Digi 90000566_H manual ARP options, Arpttl=1-20 minutes, Garp=30-3600 seconds

set network

[ARP options]

Are options that control Address Resolution Protocol (ARP) requests.

arp_ttl=1-20 (minutes)

The initial value of the ARP time-to-live variable, which is the amount of time that an ARP entry remains in the network ARP cache. When an ARP cache entry first populated, the ARP time-to-live variable is set to this value. When the entry has existed in the table for this long without being updated, another ARP cache request is performed to make sure that there is not a new a new device at that IP.

garp=30-3600 (seconds)

	The frequency of Gratuitous ARP (GARP) announcements. A
	Gratuitous ARP is a broadcast announcement to the network of a
	device’s MAC address and the IP address being used for it. This
	allows the network to update its ARP cache tables without performing
	an ARP request on the network.
	Gratuitous ARP announcements can affect latency in a limited way,
	because some systems stall or dispose of data that is transmitted
	during an ARP cache refresh. If this happens, setting the
	Gratuitous ARP frequency to be more often than the problem system’s
	time-to-live variable can cause it to refresh the cache without needing
	to perform a request.
Examples	Manually set the device IP address
	#> set network ip=10.0.0.1 gateway=255.255.255.0 submask=255.255.255.0
	dhcp=off static=on autoip=off
	Use DHCP to find an IP address, gateway address, and submask
	#> set network static=off dhcp=on
	Use DHCP or the Auto IP protocol to automatically configure network
	settings
	#> set network static=off dhcp=on autoip=on
See also	• "revert" on page 61.
	• "set autoconnect" on page 81.
	• "set dhcpserver" on page 96.
	• "set service" on page 191.
	• "set wlan" on page 241.
	• "show" on page 249.

152 Chapter 2 Command Descriptions