Increased network
stability with PRTG
jFlow monitoring

  • Use PRTG jFlow monitoring to identify overload times and potential bottlenecks
  • PRTG ensures bandwidth is used efficiently
  • With jFlow monitoring you sort and analyze your network traffic by address or application

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100 sensors, perfect for smaller networks

Sort and analyze traffic with
jFlow monitoring

Companies require increasingly larger bandwidths and sophisticated capacity management to optimize the performance of their networks and business processes, to avoid overloads, and to save money by detecting and fixing of bandwidth consumers. The Flow technology for Juniper devices (jFlow) is best suited for this, but requires professional monitoring in order to collect and analyze corresponding traffic data.

With PRTG’s jFlow monitoring, overload times and potential bottlenecks can be identified, and based on that data you can adjust your IT infrastructure as well as the available bandwidth.

During Bandwidth monitoring via the jFlow protocol the router or switch collects data packets, groups them to flows and this information about the flows is sent to PRTG via UDP. In PRTG you can filter those data automatically by traffic type (e.g. mail, web, FTP) and immediately see which applications and devices use your bandwidth within your network. You can also turn on sampling if your router supports it. Then only every n-th data packet is sent to PRTG which minimizes your CPU and bandwidth usage.

PRTG's visual presentation in top lists provides additional optimal analysis conditions: you immediately get informed by sudden increases of the bandwidth usage of a certain network address or application. With jFlow and PRTG you get the most of your network and protection against failures.

With PRTG, everyone can work with peace of mind.


PRTG’s jFlow monitoring tool collects the following info


  • Bandwidth consumption for individual/all connections 
  • Network activities and causes of traffic 
  • An overview according to protocol and service type, such as WWW, FTP, or mail 
  • Device error messages (switch, router, firewall)


This is what monitoring looks like in PRTG


This is how jFlow monitoring with PRTG works

JFlow is a data flow sampling technology optimized for Juniper devices for the monitoring of computer networks. It is mostly identical with Cisco NetFlow. Bandwidth usage data is collected in the router, firewall or switch in the form of flows and is sent to the Flow Collector PRTG via UDP. With PRTG you sort the flow automatically by traffic type (mail, FTP, or WWW) and use it for statistical processing and visualization. With PRTG you detect the originators of the data traffic within your network sorted by sender/target IP, sender/target port, IP protocol, and service type.

Flow technology is characterized by minimal bandwidth usage as well as a high degree of detail, and is especially suitable for high traffic networks.

jFlow V5 Sensor
jFlow V5 (Custom) Sensor


6 advantages of jFlow monitoring with PRTG


PRTG warns against network failures and protocol errors 



Promptly fix errors and prevent network crashes 


Network stability

A decision-making tool for traffic reduction, bandwidth usage, and the scaling of capacities 


Increased productivity

Business processes and applications benefit from optimized bandwidth usage


Analytical capabilities

Traffic visuals display correlations


Security optimization

Identify suspicious traffic and malware

PRTG simplifies your day

Our monitoring software works for you and promptly notifies you of potential issues.
It frees you to concentrate on your day-to-day tasks with peace of mind.


PRTG saves time

With PRTG, you get one central monitoring tool for your servers and entire network. Enjoy a quick overview of your whole infrastructure via our dashboard and app.

PRTG saves worry

Customizing PRTG is a breeze. Getting started or switching from another network monitoring tool is easy thanks to more than 200 sensors and pre-configured device templates.

PRTG saves money

80% of our customers report substantial or even exceptional cost savings in the area of network monitoring. The experience of our customers shows that the costs for licenses have paid for themselves in an average of 3 ½ months.



“The greatest advantage of PRTG? You get to rest easy.“

Steffen Ille, Bauhaus-University of Weimar, Germany.

Your jflow monitoring at a glance
– even on the go

PRTG can be installed within minutes and it's compatible with many mobile devices.


Award winning solution

We work hard on making our software as powerful and easy-to-use
as possible for our customers each and every day.
Of course it makes us proud when we get awards for that.



PRTG: The swiss army knife for sys admins

Adapt PRTG individually and dynamically to your needs relying on a strong API:

  • HTTP API: Access monitoring data and manipulate monitoring objects using HTTP requests
  • Custom Sensors: Create your own sensors for customized monitoring
  • Custom Notifications: Create your own notifications to send alarms to external systems
  • New REST API Sensor: Monitor almost everything that provides XML or JSON



PRTG is the PAESLLER AG's network monitoring tool. Our software is used by more than 200,000 administrators worldwide, whether it be to monitor their hardware and server performance, virtual environments, or the accessibility of their websites. PRTG is a network analysis solution for Windows.

Our network monitoring software, created in 1997, is the brainchild of Dirk Paessler. The software firm is located in Nuremberg, Germany. We are driven by the highest of standards as we continue to perfect our software. And should you ever encounter a glitch, our technical support department generally answers inquiries within 24 hours.

Get started with jFlow monitoring with PRTG. You'll save time, worry, and money. PRTG is installed in just two minutes. You get 100 free sensors, plenty for small networks. Upgrade whenever you like.


Network Monitoring Software for Windows - Version (September 11th, 2017)


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