I am using a custom NetFlow V9 sensor and the live graph which is displayed is a huge confusion for me. In parallel I am using another software which is capturing and plotting sFlow data. Using iperf I could verify that this sofware is actually displaying bandwidth values extremely accurate.
However, the live graph from PRTG differs from this graph, so either your software does not display the correct data or I am interpreting something completely wrong. Let me ask a few questions:
What does the live graph actually show? In the table below there are two fields, volume and speed. I guess speed is simply volume divided by the time interval, but it is not. Example: Total (volume) = 829 KByte, Total (speed) = 113 kbit/s To calc the speed I would have converted volume to KBit, which is 829 * 8 = 6632 KBit and then divided it by 60 because my time interval is set to 1 minute: 6632/60 = 110.53 kbit/s. This is not the value which is displayed in the speed column, so could you please explain how the speed is calculated?
What does the coverage column stand for?
Another (offtopic) question: Why is PRTG always reloading the whole webinterface every now and then? This is really annoying because when you are making certain configurations or something similar you get thrown out of everywhere, no matter what you've already typed in or where you've already navigated. Is there a way to disable this without loosing timeliness of data?
Thank you for your answer.