Delays network packets by a specific number of milliseconds.
library and applying various "functions" to them before sending them on. GitHub Pages documentation
Troubleshooting and Testing with Clumsy: The Ultimate Network Simulation Tool
Check the boxes for the impairments you want to apply (Lag, Drop, Throttle, etc.).
That's where Clumsy comes in: an open-source tool that purposely degrades your network connection. This guide will walk you through downloading the latest version (with a special look at community-supported versions like ), installing it, and using it to test your applications. Clumsy 0.4 V2 Download
: Holds network packets for a specified time frame to emulate a lagging connection.
Right-click clumsy.exe and select . Administrative privileges are strictly required because the software must interact with the Windows Filtering Platform at the kernel level. Step 3: Configuring Your First Network Filter
tcp.DstPort == 8080 : Targets traffic communicating on a specific port. Network Degradation Modules
Disclaimer: The author claims no responsibility for any network conditions, real or simulated, that may arise from following this guide. Delays network packets by a specific number of milliseconds
Clumsy is a powerful, open-source network simulation tool designed specifically for Windows. Its primary function is to artificially create network problems, such as high latency, packet loss, and bandwidth limitations, to test how well applications can withstand real-world conditions.
clumsy will choose which packets to capture by given filter, in which in can specify whether it's inbound or outbound, tcp or udp, GitHub Pages documentation Testing with Clumsy. - QATestLab Training Center
By downloading Clumsy 0.4 V2, you agree to our terms of use and acknowledge that you have read and understood our privacy policy.
The "Filter" text box tells Clumsy exactly which packets to hijack. If you leave it broad, it will lag your entire computer. That's where Clumsy comes in: an open-source tool
Ensure that you select the version compatible with your operating system (Windows, macOS, Linux, etc.).
Captures packets as they leave or enter your PC.
Clumsy is a Windows-based networking utility that allows you to intercept and manipulate your network traffic in real-time. It sits between your application and the network stack, letting you simulate "clumsy" network conditions.
While Clumsy is a legitimate tool for software development and network diagnostics, using it in public matchmaking games to gain an unfair advantage (often called "lag switching") violates the Terms of Service of almost all gaming platforms. Doing so can result in permanent hardware or account bans by anti-cheat systems like Easy Anti-Cheat (EAC) or BattlEye, which often detect the WinDivert driver running in the background. Always use Clumsy in private lobbies or local testing environments.