Lanbench May 2026

Generate a 2,000 token report.

Assuming a compiled version of LANBench (syntax varies by fork, but typical):

Start server (on 192.168.1.100):

lanbench -s -p 5001

Run client for 30 seconds, bidirectional test, 1500-byte MTU:

lanbench -c 192.168.1.100 -p 5001 -t 30 -b 1500 -d both

Sample output (client side):

Connecting to server 192.168.1.100:5001
Test duration: 30 sec, Buffer: 65536 bytes, Direction: both
[ ID] Interval         Transfer         Bandwidth
[  1] 0.00-30.00 sec  37.2 GBytes   10.65 Gbits/sec (send)
[  1] 0.00-30.00 sec  37.0 GBytes   10.59 Gbits/sec (recv)

The process typically involves:

LANBench is a lightweight, portable network benchmarking utility designed specifically for Local Area Networks (LANs). It is used to measure the throughput (speed) and stability of network connections between two computers. Unlike internet speed tests that measure connectivity to an outside server, LANBench focuses purely on the performance of the internal network infrastructure—switches, routers, cables, and Network Interface Cards (NICs).

It is particularly popular among system administrators and network engineers because it requires no installation, is free for personal and commercial use, and provides a simple graphical interface for generating network load.

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.

Is Your Network Actually Fast? A Guide to LANBench We’ve all been there: you pay for a high-speed fiber connection, buy the latest "gaming" router, and yet your large file transfers or local media streaming still feel sluggish. Often, the bottleneck isn't your ISP—it's your internal Local Area Network (LAN).

While most people reach for Speedtest.net to check their internet, those tools only measure the pipe from your house to the world. To test the hardware inside your house—your cables, switches, and Wi-Fi—you need a dedicated internal tool like LANBench. What is LANBench?

LANBench is a lightweight, portable network benchmark utility designed to test the performance between two computers. Unlike general internet speed tests, it uses the Winsock 2.2 API to push traffic directly between a "Server" and a "Client" on your own network. Key Features:

No Installation Required: It’s a portable .exe, making it easy to run on multiple machines.

Highly Adjustable: You can configure packet sizes, connection durations, and the number of simultaneous connections.

Minimal Overhead: It’s designed to "fill the pipe," pushing your hardware to its absolute limit to find where it breaks. Why Should You Use It?

Most home users assume their "Gigabit" hardware actually delivers 1Gbps. In reality, factors like poor-quality Ethernet cables or Wi-Fi interference can slash those speeds significantly.

Testing Powerline Adapters: If you use homeplug adapters, LANBench can reveal the actual throughput over your electrical wiring, which often drops significantly over distance.

Verifying Wi-Fi Performance: It helps diagnose issues where a device might show a high "link rate" but delivers poor actual "receive" speeds due to interference.

Hardware Stress Testing: It’s a favorite in the networking community for "fucking up" (stress-testing) connections to see if SFP+ modules or line cards fail under heavy load. How to Run Your First Test

To get an accurate reading, you’ll need two Windows PCs connected to the same network.

Set up the Server: Open LANBench on the first PC and click Listen. This machine is now waiting for data.

Set up the Client: Open LANBench on the second PC. Enter the IP address of the first PC.

Configure & Run: Set your duration (e.g., 20 seconds) and hit Start. LANBench

You’ll see a real-time display of your transfer rates. If you have a Gigabit network and you’re seeing anything below 800–900 Mbps on a wired connection, it’s time to start checking your cables! LANBench vs. iPerf

If you hang out on Reddit's networking forums, you'll notice many pros prefer iPerf3. While iPerf is more powerful and works across Linux and Windows, it’s a command-line tool that can be intimidating for beginners.

LANBench is the "friendly" alternative—providing a simple graphical interface that gives you the same essential "pipe-filling" data without the need to learn terminal commands. The Verdict

Whether you’re a sysadmin testing a new 10Gb link or a home user trying to figure out why your 4K plex stream is buffering, LANBench is a "must-have" in your digital toolbox. It’s simple, free, and gives you the honest truth about your hardware.

Have you tested your internal network speeds recently? You might be surprised at what’s actually holding you back.

Here’s a helpful review for LANBench, a network benchmarking tool often used to test LAN performance between two computers:

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Review Title: Simple, lightweight, and effective for basic LAN throughput testing

Rating: ⭐⭐⭐⭐ (4/5)

Pros:

Cons:

Use case:
Great for quickly validating Gigabit Ethernet performance between two Windows PCs (e.g., after cabling changes, driver updates, or switch upgrades).

Tip: Run the server on the target machine (LANBench.exe -s) and the client on another (LANBench.exe -c <server_ip>). Default settings are fine for most checks, but for real-world TCP throughput, increase test time to 30+ seconds.

Verdict:
If you need a quick, portable tool to confirm raw TCP throughput and don’t need fancy features like graphs or UDP tests, LANBench is a solid choice. For deeper analysis (latency/jitter/packet loss), pair it with ping -t, iPerf3, or NetStress.

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Would you like a comparison with iPerf3 or help interpreting LANBench results?

LANBench: The Ultimate Lightweight TCP Network Benchmark Utility

In the age of gigabit internet, high-speed NAS devices, and lightning-fast local networks, understanding your network's true performance is crucial. While many tools exist, LANBench stands out as a simple, powerful, and free benchmarking tool designed specifically for Windows TCP network throughput.

This article provides a comprehensive guide to LANBench, exploring its features, how to use it, and why it's the go-to utility for network troubleshooting. What is LANBench?

LANBench is a minimalist network benchmarking utility created by Zach Saw. Unlike complex, enterprise-grade tools that require command-line expertise, LANBench offers a straightforward graphical user interface (GUI) geared toward measuring the maximum TCP throughput between two Windows computers on a Local Area Network (LAN).

It is specifically designed for quick, reliable testing of networking hardware. Key Features of LANBench

Simple GUI: Easy to set up and start testing without command-line parameters.

TCP Focused: Optimized specifically to test TCP network performance.

Lightweight: Low overhead ensures the software doesn't bottleneck the network test itself.

Highly Configurable: Allows adjustments to packet size and concurrent connections to simulate various traffic scenarios. Generate a 2,000 token report

Free and Portable: No installation needed, making it easy to run from a USB drive. Why Use LANBench?

Whether you are an IT professional troubleshooting a slow network or a home user optimizing a newly installed NAS, LANBench provides the data needed to make informed decisions.

Validate Network Speeds: Confirm that your hardware is delivering the throughput advertised (e.g., ensuring a 1Gbps connection is actually pushing ~940+ Mbps).

Troubleshoot Latency and Bottlenecks: Identify if slow performance is due to cables, switches, or the NIC (Network Interface Card) drivers.

Optimize NAS Transfers: Test the speed between your workstation and Network Attached Storage to ensure peak transfer rates.

Test Wi-Fi Throughput: Compare the effective performance of 2.4GHz vs. 5GHz or 6GHz Wi-Fi networks. How to Use LANBench

LANBench operates on a Server-Client model. You will need two computers connected to the same network. 1. Preparation

Download LANBench from zachsaw.com and extract it on both machines. Machine A (Server): The machine receiving the data. Machine B (Client): The machine sending the data. 2. Setting Up the Server Run LANBench.exe on Machine A. Select "Server" mode. Click "Listen". 3. Running the Client Run LANBench.exe on Machine B. Select "Client" mode. Enter the IP address of Machine A in the "Server IP" field.

Adjust settings (number of connections, packet size) if necessary (default settings are usually sufficient for a quick test). Click "Run". 4. Interpreting Results

LANBench will display the results in real-time, showing speed in Mbps (Megabits per second).

Mbps vs. MB/s: Remember that 1000 Mbps (Megabits) is roughly 125 MB/s (Megabytes).

Gigabit Network Expectations: You should expect to see results consistently around 900–950 Mbps. Best Practices for Accurate Testing

To ensure your benchmark results are accurate, follow these guidelines:

Disable Firewalls/Antivirus: Temporarily disable firewalls to ensure they do not throttle the test traffic.

Run Wired: Always use Ethernet cables for testing whenever possible. Wi-Fi testing is valuable but introduces variables like signal strength and interference.

Close Other Applications: Close file transfers or internet-heavy applications on both machines.

Check Drivers: Ensure your network card drivers are up to date. LANBench Alternatives

While LANBench is excellent, other tools exist depending on your needs:

iperf/iperf3: The industry standard command-line utility. Highly accurate but less user-friendly than LANBench. NetIO: A cross-platform network benchmark. Conclusion

LANBench is an essential utility for anyone managing a Windows-based network. Its focus on simplicity and high performance makes it an ideal tool for quickly validating network speeds and solving performance bottlenecks without the hassle of complex setups.

If you are looking for a reliable, no-nonsense tool to test your LAN speed, LANBench is an excellent choice. If you'd like to dive deeper, How to interpret packet size variations? Comparison with iperf3 for specific scenarios?

Octopus ORAM: An Oblivious RAM with Communication ... - SciSpace

LANBench,A Simple LAN / TCP Network. Benchmark Utility. In http://www.zachsaw.com/, 2017. [34] E. Shi, T.-H. H. Chan, E. Stefanov, scispace.com Run client for 30 seconds, bidirectional test, 1500-byte

Octopus ORAM: An Oblivious RAM with Communication ... - SciSpace

LANBench,A Simple LAN / TCP Network. Benchmark Utility. In http://www.zachsaw.com/, 2017. [34] E. Shi, T.-H. H. Chan, E. Stefanov, scispace.com

LANBench is a free, lightweight, and portable utility designed specifically to benchmark the throughput performance of a Local Area Network (LAN) between two computers. It is a highly focused tool, optimized for minimal CPU overhead to ensure that results reflect pure network performance rather than local system bottlenecks. Key Performance Features

Dual-Node Operation: LANBench uses a server-client architecture. One machine acts as a server (listening for traffic), while the second acts as the client to initiate the benchmark.

Protocol Support: It primarily tests TCP performance based on the Winsock 2.2 framework. While some versions may offer UDP testing, many core releases are specialized for TCP-only diagnostics.

Simultaneous Connections: Users can simulate network load by opening up to 20 multiple simultaneous connections during a single test run.

Configurable Parameters: The tool allows for granular control over the test environment:

Packet Size: Adjustable data block sizes for each send request.

Test Duration: Specific time periods for benchmarks (e.g., 10 seconds).

Transfer Modes: Options to test "Send Only," "Receive Only," or bidirectional "Send and Receive" performance. Usability and Portability

Zero Installation: LANBench is a standalone executable that does not require installation or system registry changes, making it ideal for a USB toolkit.

Real-Time Monitoring: The main interface displays current send/receive data and calculates average speeds throughout the test duration.

Wide Compatibility: It is known to run on most Windows versions, including legacy systems like Windows XP and Server 2003/2008, up through Windows 7 and beyond. Limitations to Consider LANBench for Windows - Free download and software reviews

This is the story of , the silent sentinel of the local network.

Once upon a time in the cluttered workshop of a home lab enthusiast, a new "gigabit" switch had just arrived. It was sleek, cheap, and promised lightning-fast speeds for video editing and hosting [1]. But as soon as the first file transfer began, the progress bar crawled like a tired snail. The enthusiast suspected the switch was a fraud, or perhaps the old Cat-5 cables hidden in the walls were finally giving up the ghost [5, 18]. To find the truth, the enthusiast reached for , a simple but powerful benchmark utility based on Winsock 2.2

[2]. Unlike heavy file-transfer tests that are slowed down by slow hard drives or high CPU usage, LANBench was built for one thing: pure network performance [2].

The enthusiast set up one computer as the server and another as the client. With a few clicks, LANBench began firing digital packets across the wire. It didn't care about file sizes or disk speeds; it focused solely on the TCP performance between the two machines [2, 4]. The First Test

: With 20 simultaneous connections and a 4096-packet size, the screen flickered with data [4]. The results were abysmal. The "gigabit" connection was barely hitting 100 Mbps [12, 14]. The Investigation

: Was it the switch? The enthusiast bypassed it and connected the PCs directly. LANBench roared to life, hitting 900+ Mbps [5]. The switch was the culprit.

: But the story didn't end there. In a different room, a run of old, unshielded Cat-3 cable

—meant only for phones—was put to the test. Everyone said it would fail. But LANBench showed a steady 900 Mbps [5]. The "lowly" phone wire was over-engineered and outperformed the brand-new switch. In the end,

didn't just provide numbers; it provided the evidence needed to return the faulty hardware and trust the hidden potential of old wires [5, 10]. It remains a favorite for those who want to test the "pure" limit of their network without the noise of the rest of the system [2]. technical steps

for setting up a LANBench test between two of your own computers?

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