Bean Network Tester

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.

What it can do:

• 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.