Data View

This view shows the collected data of one or mores sensors in one graph.

To visualize the data of more than one sensor you can select several sensors from the list of sensors. Simply use CTRL while clicking an item to select disjointed items from the list, or use SHIFT while clicking an icon to select several sensors. Or, select a group.

If a group or more than one sensor are selected you can switch between Single Graph (the data of all sensors is shown in one chart, shown on the left) and Multiple Graphs (one graph for the data of each sensor, on the right):

If only one sensor is selected you can choose between graphs and three data tables on the right:

These data tables show the data for the last 24 or 48 hours, last 30 days, or last 365 days (these periods can be changed in the options) :

Please note the special column “coverage”: This value tells you if the monitoring was actually working all the time and has covered the complete time period.

E.g. if PRTG is shut down for 15 minutes of an hour you will see a value of 75% of coverage for the remaining 45 minutes that were covered by monitoring.

If you need reliable and full data from your monitoring this value should always be 100% or close to 100%.

If the coverage is below 100% but PRTG was running all the time then there is a technical problem with the sensor. PRTG was not able to get all the data it needs to completely calculate the traffic over time. Most common reasons are network problems (e.g. packet loss, connectivity issues) and device problems (e.g. some devices limit the number of SNMP request per minute, so if they are scanned too frequently a number of requests remain unanswered).

For Packet Sniffer and NetFlow Sensors you will also see tabs for the so-called Toplists (e.g. with lists of the Top Talkers, Top Protocols and Top Connections). For each sensor you can also configure additional customized toplists.

Toplists can be computed based on source or destination IP and Port as well as other parameters.

In the lists you will see a number of columns for the selected values (e.g. source IP). PRTG tries to resolve the IP addresses into DNS names if possible. IP addresses shown in brackets could not be resolved by reverse DNS.

The Trend column shows a value that is calculated by subtracting the current position in the list with the position of the previous toplist interval. A value of zero (0) means that an entry is at the same position in the list as in the previous interval, +5 means that the entry has climbed 5 positions. PRTG shows big changes in the list position with a background in various shades of a red to make it easy to see sudden changes.

The pie or bar chart (you can choose the type in the View|Colors & Layout dialog) always shows the data volume of the top 10 entries.