This read-write parameter controls whether ARP cache entries are automatically refreshed before they expire or simply aged out and removed. A network engineer might enable refresh mode to keep entries for long-lived connections fresh so the device never loses track of important hosts, or disable it to let stale entries expire and reduce memory usage. For example, with refresh mode enabled, a server that was contacted once will remain in the ARP table indefinitely through periodic refreshes, but with refresh disabled, it will be forgotten after the timeout period (typically minutes to hours).