What happens on the network when I select the Search router ARP caches option on the Discovery Wizard – Discover Non-Router Devices page?
AutoDiscovery queries again each discovered router to read that router’s ARP cache. An ARP cache contains the IP address and MAC address for each network device (switch, server, printer, and so on) known to a router. SNMP GetNextRequest messages are again used to query each router’s ipNetToMediaTable object (see RFC 1213) or ARP cache. Each SNMP reply generated by a router includes the ipNetToMediaPhysAddress, or MAC address, for each host on the network known to the router. AutoDiscovery learns the IP address and corresponding MAC address of each host on the queried router’s subnet by sequentially reading the ipNetToMediaTable values. Any new device information, including subnet information, is added to the database enabling device connectivity to be modeled. Note: Routers and other TCP/IP devices tend to remove unused ARP cache entries over time. Therefore, the ARP cache is not a complete representation of devices on the network. Instead, it only contains devices that have recently t
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