What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general. You are invited to get involved by asking and answering questions!

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
300.000 administrators have chosen PRTG to monitor their network. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags


View all Tags

Is It correct for the Netflow sensor to perform real-time analysis?

Votes:

0

Your Vote:

Up

Down

I am using Netflow v9 sensors to receive Netflow data.

The device does not use sampling and the active flow timeout is 30 minutes, which is the default value of the device. In the sensor setup, the scanning interval is 60 seconds and the active flow timeout is 31 minutes.

Are the values collected in Top Talker and Top Connections based on real-time analysis?

Does a netflow sensor discard Netflow packets longer than 31 minutes?

active-flow-timeout netflow-sensor netflow-v9 top-connections

Created on Feb 27, 2021 2:34:50 PM by  Jonathan_Jung (1) 2



3 Replies

Votes:

0

Your Vote:

Up

Down

Hello Jonathan,

Regarding your questions, I invite you to have a look to our KB article about Active Flow Timeout: https://kb.paessler.com/en/topic/66485-what-is-the-active-flow-timeout-in-flow-sensors

If you have further questions, let us know.

Regards.

Created on Mar 2, 2021 1:25:59 PM by  Florian Lesage [Paessler Support]



Votes:

0

Your Vote:

Up

Down

Hi, Florian Lesage

The article you mentioned is helpful, but there's no answer I'm looking for.

Please kindly answer the questions below.

Are the values displayed in Top Talker and Top Connections based on real-time analysis?

After receiving all Netflow data continuously, does netflow sensor calculate and refresh the live data at every scanning interval?

Thanks, Jonathan Jung

Created on Mar 2, 2021 3:18:38 PM by  Jonathan_Jung (1) 2



Votes:

0

Your Vote:

Up

Down

Hi Jonathan,

At each scanning interval, the top lists (Top connection, top protocols, etc.) will indeed be updated with the data received by the sensor. As indicated in the KB article, the flows are segmented into small flows which are processed at each scan interval, allowing to get live-data instead of waiting for the end of data transmission between devices which could take some time.

Regards.

Created on Mar 3, 2021 9:12:39 AM by  Florian Lesage [Paessler Support]



Please log in or register to enter your reply.


Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.