The ARP cache maintains a table of IP address to MAC address translations. The ARP cache should never get unmanageably large because ARP is only used to resolve MAC addresses on a local segment. Local segments on well-designed networks are created with a limited number of network hosts to prevent overabundant ARP and other broadcast traffic.
All remote communications are done through the gateway and only the
gateway MAC is used to send requests to remote clients.
This was first published in June 2002