Network Management

NTA - How to configure nProbe to export flows to Solarwinds NTA

If customers do not have equipment in their network that support any type of flow technology ( Netflow, sFlow, J-Flow) they can leverage a third party software call nProbe to collect Netflow data and have IP conversation visibility into their network using non-flow capable devices.

First published date

10/19/2018 6:03 PM

Last published date

10/19/2018 6:03 PM

Overview

If customers do not have equipment in their network that support any type of flow technology ( Netflow, sFlow, J-Flow) they can leverage a third party software call nProbe to collect Netflow data and have IP conversation visibility into their network using non-flow capable devices.

Product section

Netflow Traffic Analyzer

Cause

n/a

Resolution

Here’s how to set up nProbe to work with Orion NTA:

1. Download and install nProbe on a Windows (or Linux) server

  • Download an evaluation version of nProbe (© 1998-2016 ntop , available at http://www.ntop.org/, obtained on November 2, 2016.) and install it on a server. As noted in the diagram above, you'll need a server with two NICs - one to connect to the span port of the switch and the other to export flows to the Orion NTA server.   

2. Enable port spanning or port mirroring on your Managed Switch

  • Configure port mirroring or port spanning on your managed switch to the port that the server running nProbe is connected. This will allow nProbe to see all traffic flowing through the switch. You’ll need to consult your switch documentation for how to configure port mirroring or port spanning. If possible, consider only spanning the ports of interest to reduce the amount of flow data collected.

3. Add the nProbe server to Orion

  • Add the server running nProbe to Orion, including all interfaces.
  • Add the server interfaces as monitored NetFlow Sources.
  • Go to NTA settings and enable “Allow monitoring of flows from unmanaged interfaces”.

4. Configure nProbe to export flows to Orion NTA

  • Open command prompt on nProbe server and navigate to C:\Program Files\nProbe-Win32.
  • Run nProbe from CLI using the options listed below:

             nprobe

                 /c - output to console. This is the easiest method, especially for a demo situation, because you can review the debug messages.

                 -n <Orion NTA server address>:<port>  - IP address and port that should receive the flow records. Use 2055 for port.

                 -b 1 - modest level of reporting

                  -i  <interface> - generally 1 on Windows; en0/eth0 on Linux; en0 for Ethernet on OSX, en1 for wireless

                 -u <in-index> - sets the ingress interface for all flows (use 1).

                 -Q <out-index> - sets the egress interface for all flows (use 2).

          E.g. nprobe /c -i 1 -n 10.199.15.50:2055 -b 1 -u 1 -Q 65539

  • NOTE: It’s important the ingress (-u) and egress (-Q) interface indexes be set to the server interfaces being managed in Orion. NTA will drop flows from interfaces that are not managed in Orion. You can see the interface index for the server interfaces in Orion by drilling down to their respective interface details view. So, if your nProbe server had two interfaces being monitored in Orion NTA (© 2018 SolarWinds Worldwide, available at www.solarwinds.com, obtained on Dec 05, 2018), you would just set the option –u to the index of one of them and the –Q switch to the index of the other. See nProbe documentation (© 1998-2016 ntop , available at http://www.ntop.org/, obtained on November 2, 2016.) for other command line options.