Foglight for Infrastructure 7.3.0 - Foglight for Net Monitor User and Reference Guide

Investigating the performance of network devices

A typical monitored environment includes a set of monitored network devices and Net Monitor Agents that collect data about these devices. These components are displayed on the Performance Browser dashboard. Use this dashboard to see the state of individual network devices when monitored from one or multiple locations.

You can access this dashboard from the navigation panel. Under Dashboards, click Infrastructure > NetMonitor > Performance Browser.

When you navigate to the Performance Browser for the first time, the Monitoring tab appears open. This tab provides an overall summary of your monitored network devices.

TIP: In addition to the Monitoring tab, the Performance Browser also offers the FAQ tab. For more information, see Exploring the FAQ tab.

Start by indicating the type of objects that you want to investigate. To do that, select the appropriate tile at the top of the Monitoring tab: Network Devices or Monitor Locations. This causes the Quick View to display information about the selected objects. Next, select an object or group of objects in the Quick View, such as All Network Devices or All Monitor Locations, to display additional information about that selection.

For complete details about the views appearing on this dashboard, see Net Monitor Performance Browser views.

For more information, see the following topics:

Exploring individual network devices

When you select a network device in the Summary - All Devices view, you can see additional information, such as response times and packet loss values, in the Device Detail view. High levels of these indicators typically point to network congestion, and may require additional investigation.

For complete details about the data appearing on this view, see Device Detail view.

Tracing data packets between monitoring locations and network devices

When you monitor a network device from a monitoring location, the monitoring agent sends a configured number of data packets to the device. The complete path of each data packet, from the monitoring location to the network device, represents a route. On the way to its destination, a data packet often runs through a number of other devices, so the route consists of one or more hops, where each device it passes through is counted as one hop.

The Trace Result view allows you to trace a route between a monitoring location and a network device, and review the time a data packet spends at each individual hop. This can help you investigate signs of performance degradation. For example, if your system reports higher than usual response times and frequent time-outs, you can trace the route of data packets to determine what is causing the bottlenecks.

Another example is when a device ping times out, this may be related to a possible wrong network route which can be seen on this page. For instance, if the expected trace route consists of ten hops, but the trace route in the chart appears to consist of five hops, you can identify the IP address associated with the broken hop in the chart. This can help you to quickly identify the root cause of a broken network.

For complete details about the data appearing on this view, see Trace Result view.

IMPORTANT: If the trace route option is disabled in the device settings (see Viewing and editing individual network device details), this page is not populated with data. You can quickly execute a trace route in real time on this page by clicking Trace Route Now.

Exploring the FAQ tab

The FAQ tab available on the Performance Browser allows you to look at frequently asked questions about your monitored devices and review the answers. The Categories view shows several question categories. Selecting a category shows the questions belonging to that category in the Questions pane. From there, clicking a question shows the answer on the right.