Lanbench Online

is a standalone, lightweight utility designed to benchmark network performance between two computers using the TCP protocol

. It is built on Winsock 2.2 and is specifically engineered for low CPU overhead to ensure that results reflect pure network throughput. Key Features Performance Monitoring:

Measures real-time network speeds between a designated client and server. Multiple Connections: Supports testing with up to 20 simultaneous connections to simulate high-load environments. Customizable Parameters:

Allows users to configure packet size, test duration, and transfer modes. Transfer Modes:

Supports Send-only, Receive-only, and Bidirectional (simultaneous) data transfers. How to Use LANBench

To generate a performance report, you must run the tool on two different computers connected to the same network. Server Setup: LANBench.exe button to prepare the machine to receive data. Note the server's IP address (can be found by running in the Command Prompt). Client Configuration: LANBench.exe on the second computer. File > Configure IP address of the server computer. Adjust settings such as packet size and duration as needed. Running the Test:

Results will appear on the main screen, typically reported in Typical Results and Limitations Consistency:

Unidirectional tests (send or receive only) usually yield consistent results. Bidirectional Variance:

Running send and receive simultaneously often shows greater variation and may result in lower overall speeds compared to single-direction tests. Reporting Units:

Unlike many modern tools that use Mbps or Gbps, LANBench frequently displays speeds in

For alternative network testing tools with more modern interfaces or different protocols (like UDP), users often consider

How to use iperf to test local network LAN speed in Windows 10

LANBench: A Comprehensive Guide to Benchmarking Network Performance

LANBench is a lightweight, portable network benchmarking utility designed to measure the TCP performance of a Local Area Network (LAN). Built on the Winsock 2.2 framework, it is optimized for minimal CPU overhead, ensuring that test results reflect pure network throughput rather than being bottlenecked by host processor performance. Key Features and Specifications LANBench

LANBench is favored by network administrators for its simplicity and focused functionality. Its primary features include:

TCP-Only Testing: Specifically designed to benchmark TCP performance.

Minimalist Interface: A clear-cut UI featuring a small menu bar and a display panel for real-time performance data.

High Portability: The tool is a standalone executable that does not require installation or registry updates, making it easy to run from a USB drive.

Low Resource Usage: Uses the Windows I/O completion port for efficient multi-threading with negligible CPU impact.

Simultaneous Connections: Supports up to 20 concurrent connections to simulate network load. How to Use LANBench

Testing with LANBench requires two Windows-based computers connected to the same network segment. 1. Server Configuration On the first computer, which acts as the Server: Open the LANBench executable. Click the Listen button.

Identify the computer's IP address (typically using ipconfig in the command prompt), as this will be required for the client setup. 2. Client Configuration On the second computer, acting as the Client: Navigate to File > Configure. Enter the IP address of the Server machine. Adjust test parameters as needed, including: Test Duration: The length of time the benchmark will run.

Packet Size: The size of the data blocks sent during the test.

Transfer Mode: Choose between Send Only, Receive Only, or Send and Receive (simultaneous bidirectional testing). Click OK and then hit the Test button to begin. Interpreting Results

During and after the test, the main window displays the currently sent and received data rates along with:

Average Speed: The mean throughput recorded over the test duration.

Minimum/Maximum Speeds: Highlights the consistency and peaks of the connection. is a standalone, lightweight utility designed to benchmark

CPU Load: Monitored to ensure the host machine did not interfere with the results. Why Use LANBench?

While more advanced tools like iPerf or LAN Speed Test exist, LANBench remains a popular choice for quick, no-fuss assessments of network hardware like routers, switches, and gigabit adapters. It is particularly useful for identifying bottlenecks after new hardware installations or when a decline in performance is suspected.

Despite the original developer's site being offline, LANBench remains widely available on reputable software repositories like Softpedia. Three More Ways To Measure Network Speed - SmallNetBuilder

LANBench is a specialized, lightweight utility designed to benchmark the speed of a local network (LAN) connection between two computers. It is highly regarded for its portability and minimal system impact, making it a staple for quick network diagnostics without the need for complex installations. Core Functionality

Operating Principle: The tool requires two instances to run: one acting as a Server (listening on a specific port, typically 8988) and the other as a Client.

Protocol Support: It primarily tests TCP performance but can also measure UDP speeds.

Low Overhead: It is built using Winsock 2.2 and designed for minimal CPU usage to ensure that test results reflect pure network performance rather than hardware bottlenecks. Key Features

Customizable Tests: Users can configure packet sizes, test durations, and transfer modes (send only, receive only, or both).

Simultaneous Connections: Supports up to 20 multiple simultaneous connections to simulate heavy load scenarios.

Portability: It is a single executable that requires no installation, making it easy to carry on a USB drive. Pros and Cons Pros Cons

Accurate Real-World Throughput: Provides a focused measure of network speed.

Lacks Modern UI: The interface is functional but dated, missing advanced graphical visualizations.

Efficiency: Multithreaded design utilizes Windows I/O completion ports for high performance. Setting Up: One computer acts as the server,

No Automated Logging: Does not natively provide automated logging or history features found in tools like NetIO-GUI.

Free and Simple: Ideal for users who need a direct, no-frills benchmarking tool.

Technical Requirement: Users must manually configure IP addresses and ports on both ends. Comparison with Alternatives

While LANBench is excellent for raw TCP/UDP testing, other tools may be better suited for specific needs:

LAN Speed Test: Better for testing file transfer speeds to shared folders or hard drives.

NetIO-GUI: Preferred for users who need to save test results in a database for later comparison.

TamoSoft Throughput Test: Offers better graphical output and identifies UDP packet loss more effectively. LANBench for Windows - Free download and software reviews

1. Infrastructure Verification

When upgrading network hardware (e.g., upgrading from Cat5e to Cat6 cabling, or installing a new 10GbE switch), LANBench verifies that the hardware is actually negotiating at the correct speeds. If a 10 Gbps link is only showing 1 Gbps throughput, the issue can be isolated immediately.

How Does It Work?

The process typically involves:

  1. Setting Up: One computer acts as the server, and another as the client. The server listens on a specified port, while the client initiates the connection and starts the test.

  2. Running the Test: Once connected, the tool transfers data between the two machines, calculating the throughput based on the transfer rate.

  3. Reporting Results: After the test is completed, LANBench reports the achieved throughput, which can be used to assess the network's performance.

Key Features

Key Features

8. Conclusion

LANBench fills a specific but important niche: maximum raw throughput testing with minimal CPU involvement. While it lacks the polish and feature richness of iPerf3, its simplicity is its strength. For network engineers debugging high-speed LAN performance issues, or for validating that a 10G link truly can achieve 10G, LANBench is an indispensable tool. However, for comprehensive network characterization including TCP behavior, latency, and multi-stream fairness, iPerf3 or Netperf remain superior choices.

Final Recommendation: Use LANBench as a second opinion when iPerf3 shows suspiciously low throughput on a high-speed LAN. If LANBench achieves line rate and iPerf3 does not, the bottleneck is in the TCP stack, CPU, or driver—not the physical network.

Product Name: LANBench

Tagline: "The Ultimate Local Area Network Stress Test."