User manual

set network

152 Chapter 2 Command Descriptions

[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