Network Discovery

Immediately after a new install, you'll notice a Discovery group created for the Local gateway. The Discovery group contains all the devices discovered on your own local network.

If you create a new gateway, a similar discovery group is created just below that gateway.
After the initial run, network discovery runs daily at 2:00 AM, gateway time, by default.

One Gateway Per Local Area Network

The gateway performing the discovery needs to be physically or logically (VLAN) connected to the network that you specify. Having router access only is not enough. Network discovery uses ARP requests to look up the MAC address of IP addresses, and ARP requests never travel beyond the same local area network (router). There is no way for the the gateway to see the MAC address of devices beyond the local area network. So to get the best possible coverage from network discovery at least one gateway must be placed in each local area network.

Monitoring and Alerts

You can assign monitors to devices in the Discovery group and even see the data reported back by the monitor. But you cannot generate an alert for a device while it is inside the Discovery group.

Licensing

No monitoring licenses are consumed by a device inside the Discovery group. When you move a discovered device out of the Discovery group, a license is consumed.

Running Network Discovery Manually

Network discovery can only be run manually from the Advanced tab of a gateway node.

Select a gateway node in the navigation tree.
Click Edit in the right hand pane.
Click the Advanced tab.
Click the Enable checkbox for the Network Discovery section of this tab.
Specify up to three subnets. A tooltip displays accepted formats:
- Using CIDR notation - 192.168.1.0/24
- By Range - 192.168.1.0-255
- Single IP Address - 192.168.42.0
Click the Start now checkbox.
You must move discovered devices out of the Discovery group to start generating alert notifications.