: You need to test the physical medium and NIC drivers at full line rate, and you suspect the OS TCP stack or CPU is the bottleneck in iPerf3 results.
Supports up to 20 concurrent streams to simulate heavy load environments and saturate local bandwidth.
LANBench is a simple, yet powerful TCP network benchmarking utility designed specifically for measuring LAN throughput. What is LANBench?
./lanbench run --config benchmark.yaml --output results.json LANBench
: Adjustable to test how different data sizes affect throughput. Test Duration
Get LANBench from its official source or reputable software repositories—the file weighs just about 1.9 MB. Since it is portable, you can run LANBench directly from a flash drive on any compatible Windows machine (Windows 2000 through Windows 11).
Unlike speed tests that measure internet bandwidth, LANBench focuses exclusively on local network performance. This distinction is crucial because many factors—from cable quality to router configuration—can impact internal network speeds even when your internet connection performs well. Whether you are a network administrator optimizing a corporate infrastructure or a home user diagnosing slow file transfers between PCs, LANBench provides the numerical data needed to identify bottlenecks. : You need to test the physical medium
| Parameter | Options | | --- | --- | | | Set the length for each measurement run (e.g., 10 seconds, 30 seconds, 1 minute) | | Packet Size | Adjust the size of data packets transmitted during testing (from small control-sized packets up to large jumbo frames) | | Connections | Configure up to 20 simultaneous TCP connections to simulate real-world multitasking or heavy load scenarios | | Transfer Mode | Select between bidirectional communication (send and receive), unidirectional upload testing, or unidirectional download testing | | Server Address | Input the IP address of the listening computer (e.g., 192.168.1.105 ) | | Port Number | Match the port configured on the server side (default port is 8988) |
Execute the client:
: The tool allows for granular control over the test environment: What is LANBench
LANBench operates using a model.
: Checking if a new gigabit switch or router actually delivers advertised speeds.
It’s a standalone tool that doesn’t require a bulky installation, making it perfect for quick diagnostics. How to Run Your First Benchmark
Highly optimized to prevent system processor limitations from throttling network speed tests, making it reliable for gigabit and multi-gigabit connections.
This report details the utility and performance results for , a specialized network benchmarking tool designed to test the throughput and stability of local network hosts. Overview of LANBench