: Clumsy applies the user's enabled parameters (such as a 200ms lag delay or a 5% drop chance).
is a Windows utility designed to simulate poor network conditions for testing and debugging purposes. While the official version by developer is currently at
Reorders packets arbitrarily, forcing the application protocol (like TCP) to reassemble them under stress.
If you must have the older 0.4 v2 release, a verified source is a GitHub mirror that holds a complete 0.4 version archive in RAR format. Beyond that, you can often find "Clumsy 0.2" or "Clumsy 0.5 v2" on Chinese download portals like Zuixu.com or developer discussion boards like Tencent Cloud’s developer center. No matter where you get the file, check that it has the WinDivert library embedded correctly and that the file size looks reasonable (around a few hundred kilobytes). clumsy 04 v2 download top
| Problem | Solution | |---------|----------| | “Driver not loaded” | Run as Administrator. Reboot if WinDivert is locked. | | No traffic captured | Disable antivirus real-time scanning (temporarily). | | System slowdown | Reduce the use of “Throttle” and “Tamper” simultaneously. | | Filters not applying | Ensure filter syntax is correct (e.g., tcp.DstPort == 80 ). |
: Extract the .zip file and run clumsy.exe directly; it does not require a setup wizard but must be run as administrator .
: Sends some packets twice in a row, which can cause problems for protocols that rely on in‑order delivery. : Clumsy applies the user's enabled parameters (such
Hit the Start button. Clumsy will immediately begin altering your network packets based on your configuration. Click Stop to return your network to normal instantly. Common Use Cases
Check the boxes next to the network conditions you want to simulate (e.g., check Lag and set it to 150 ms).
: Use the default inbound or outbound text filters, or specify a target IP address or port (e.g., ip.DstAddr == 192.168.1.1 ). If you must have the older 0
: Randomly discards packets to simulate a "lossy" connection.
Network conditions are rarely perfect. Users deal with lag, dropped packets, and out-of-order packets. If you aren't testing for these scenarios, you aren't truly ready for production.
Clumsy is a portable application, meaning it does not require a standard Windows installation wizard.