How Device Discovery Works

A device discovery service scans the network using the Ethernet interface and returns a list of found devices.

Discovery is disabled on all interfaces, by default.
Discovery probes every address in the network at one-second intervals. Therefore, it may take some time to scan an entire network.
The scan never stops and after 10 minutes, if a device has not been seen on the network, it is removed from the list.

Restrictions Enforced

Due to the constant network activity generated by Device Discovery, certain restrictions are enforced to prevent:

Security alerts: Because discovery regularly scans the network, security systems (such as Trojan detection systems) might flag this activity. To avoid security alerts, network scanning is limited to one-second intervals, with devices dropped after 10 minutes.
Missing devices: Discovery is supported only on subnet /24 networks, to limit the number of nodes that need to be discovered. On networks larger than /24, discovery would likely take longer than 10 minutes to find all the network nodes, which would cause devices to be dropped from the list.

Enable Device Discovery

To enable device discovery:

The populated list includes a Last Seen column and also indicates the last time Device Discovery scanned the network.