Bean Network Tester is a tool for testers and developers: check how your application behaves on a poor connection. Like Clumsy or NetLimiter, it lets you deliberately degrade the network - add ping, drop packets, cap the speed, tear connections down, and more. It works by intercepting traffic with the WinDivert driver (via PyDivert), and offers both a clear windowed interface with tooltips and a command-line mode for CI.

Features

  • Add lag and jitter - fixed or random delay.
  • Drop, corrupt or duplicate packets - fake a flaky link.
  • Cap download/upload speed - throttle to a set KB/s.
  • Tear connections down - TCP resets or a dead link.
  • Flap the link on and off - outages that come and go.
  • Block ports or IPs - a small built-in firewall, plus LAN mode (no internet).
  • Aim at one app - by process, PID, IP or port.
  • Presets and saved profiles - 56k modem, Cafe WiFi, Satellite and more.
  • Run scripted scenarios - timed steps that change the network on their own.
  • Reproducible by seed - replay the exact same random loss and jitter.
  • Watch it live - chart, connections table, counters.
  • Command-line mode - scriptable for CI.
  • No telemetry, fully offline - sends no data anywhere.

Project Samples

Project Activity

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License

GNU General Public License version 3.0 (GPLv3)

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Additional Project Details

Operating Systems

Windows

Languages

English, Polish

Intended Audience

Developers, Information Technology, Quality Engineers, Security Professionals, System Administrators, Testers

User Interface

Console/Terminal, Tk

Programming Language

Python

Related Categories

Python Software Testing Tool, Python QA Automation Software, Python Network Simulators

Registered

2026-07-20