The Paessler NetFlow Generator is a free, lightweight simulation tool developed by Paessler GmbH. It generates artificial NetFlow Version 5 data streams to help administrators test network monitoring setups without needing actual NetFlow-compatible hardware.
The utility acts as a traffic simulator. It sends NetFlow packets over User Datagram Protocol (UDP) to a designated target computer, such as a machine running PRTG Network Monitor. Key Features
Hardware-Free Simulation: Creates realistic flow data without requiring expensive routers or switches to export physical traffic.
Traffic Pattern Control: Allows users to configure various traffic loads and patterns directly from its main user interface.
Target Mapping: Sends generated NetFlow v5 packets to any designated IP address and port.
Metadata-Only Generation: Simulates only the information about the traffic patterns (metadata packets). It does not generate or pass the actual payload data over the network, keeping your live bandwidth clear. Primary Use Cases
PRTG Verification: Confirms that your PRTG NetFlow v5 sensors are correctly receiving, parsing, and displaying bandwidth data.
Dashboard Testing: Validates custom dashboards, threshold alerts, and network maps before deploying them in production.
Third-Party Compatibility: Evaluates other NetFlow-compliant collector software to ensure they capture v5 flow data accurately. Implementation Details
The software runs locally on a Windows PC as a standalone executable file (NetflowGenerator.exe) extracted from a ZIP package. It requires no formal installation. Users simply input the target IP address and listening port of their flow collector, select their preferred traffic patterns, and launch the stream. Related Utilities
Paessler offers this utility alongside other free troubleshooting tools available on the Paessler Free Tools Portal:
NetFlow Tester: A debugging utility that dumps raw data packets received from a Cisco router to verify configurations.
sFlow Tester: A tool that logs and displays inbound sFlow packets for structural validation.
Simulates NetFlow data streams for testing purposes – Paessler
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