Click the button at the bottom of the interface. Clumsy will immediately begin altering the filtered traffic. To stop the simulation and return your network to normal, simply click the Stop button. Troubleshooting Common Issues "Failed to open WinDivert driver" Error
Clumsy solves this problem by letting you recreate virtually any network pathology on a single Windows machine. You can test how your application behaves when packets are delayed by 200 milliseconds, or when 10% of packets are randomly dropped, or when data arrives out of order. Best of all, clumsy works at the system level, which means:
: Randomly discard a percentage of packets to simulate packet loss. Throttling
While Clumsy is excellent for quick, on-the-fly testing, you might want to explore other tools for specific advanced needs.
Finding a safe, legitimate download source is crucial when dealing with any network‑level tool. Clumsy is open source and free to use, but you must be careful to download it from official or trusted sources only. clumsy 04 v2 install download
While Clumsy is generally reliable, new users sometimes encounter problems. Here’s how to fix the most common issues.
: Hold packets for a specified period to emulate high-latency connections. Packet Dropping
[ ] Lag --> Delay packets by a fixed time (in milliseconds). [ ] Drop --> Randomly discard packets based on a set percentage. [ ] Throttle --> Block traffic temporarily, then release it in bursts. [ ] Duplicate--> Send identical packets twice to test redundancy handling. [ ] Out of order --> Shuffle the arrival sequence of network packets. [ ] Tamper --> Modify packet payloads randomly to simulate corruption. Launching the Simulation
: ip.DstAddr == 192.168.1.50
The text box dictates which traffic Clumsy intercepts. Leaving it blank captures all traffic, which can destabilize your system. Use standard WinDivert filtering syntax: outbound : Intercepts only traffic leaving your computer.
Right-click clumsy.exe and select Run as administrator . If prompted by Windows User Account Control (UAC), click Yes to grant network interception permissions. Step 4: Configuring Filters and Functions
: System error stating MSVCR120.dll or a similar runtime file is missing.
Before we dive into the installation process, let’s clarify what “clumsy 04 v2” actually refers to. The clumsy project on GitHub (maintained by user jagt) has seen a few official releases, with version 0.2 being the most widely recognized and documented. The official version numbering scheme uses a “0.x” format — so “0.4” would logically be the fourth major release. Click the button at the bottom of the interface
While newer, unofficial forks might exist, the version often referred to as "0.4" (or 0.4 v2) is celebrated for its stability, intuitive GUI, and robust feature set on Windows 7, 8, 10, and 11. It strikes the perfect balance between power and ease of use, making it the standard for local network testing. Clumsy 04 v2 Download & Install Guide
Clones packets and sends them consecutively to simulate network echoes. Out of Order: Reorders packets to test protocol resilience.
If Clumsy refuses to start and highlights the filter text box, your syntax is incorrect. Refer to the standard WinDivert filtering documentation. Ensure you are using double equals signs ( == ) for comparisons and correct boolean logic ( and / or ). Internet Cuts Out Entirely