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Netflow not receiving flow

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I've set up netflow on all my branch routers. I noticed that all probes showed the same information. I then added a senders IP and now the probe is not showing any flow data. Any ideas why this is occurring?

ip-flow-export netflow-sensor netflow-v9

Created on May 25, 2017 1:18:24 PM by  JGreen (0) 1



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Hi JGreen,

Usually, devices only send their flows to one specific IP - is that configured to one of the probes IPs?


Kind regards,
Stephan Linke, Tech Support

Created on May 26, 2017 6:40:26 AM by  Stephan Linke [Paessler Support]



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I have a server where al me devices send their flow data to. My issue is I am not able to see flows for each device instead, each probe reports the same flow traffic. Once I add the IP of the interface I have the flow exporter configured on to the "Senders IP" under the probe settings all flow data stops.

Created on May 26, 2017 12:30:57 PM by  JGreen (0) 1



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Hi JGreen,

Then this device probably doesn't send NetFlow data (either at all or PRTG can't decode them).
Please use our NetFlow Tester to check if any flows are received from the device.


Note You may need to pause the actual sensor in PRTG in order to open the port for the tool


Kind regards,
Stephan Linke, Tech Support

Created on May 26, 2017 1:38:37 PM by  Stephan Linke [Paessler Support]

Last change on May 26, 2017 1:38:48 PM by  Stephan Linke [Paessler Support]



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All of the devices I have setup send flow data. I had all the flow data for my devices working fin in Solarwinds. I wanted to try prtg and see how they compare. I have a netflow probe setup under every device with no issues. Once I discovered that the probes under each device were not showing flows for the device they were attached to I tried adding the sender IP to separate the flow data. Once I did this, the probe stopped working.

Created on May 26, 2017 2:11:40 PM by  JGreen (0) 1



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Wait, is Solarwinds still running on the same server as PRTG?

Created on May 29, 2017 7:29:13 PM by  Stephan Linke [Paessler Support]



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Yes it is

Created on May 30, 2017 1:15:41 PM by  JGreen (0) 1



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Sorry for the delay - you'll actually have to stop Solarwinds (or pause the netflow sensors/nodes) in order for PRTG to retrieve the flows correctly. As of right now, Solarwinds is "stealing" the packets ;)

Created on May 31, 2017 10:21:58 AM by  Stephan Linke [Paessler Support]



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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.