Testing Local Area Network speed

Testing Local Area Network (LAN) speed is important to evaluate network performance, troubleshoot issues, and optimize your internal network. Here’s how you can test LAN speed using various methods:

1. Use Dedicated LAN Speed Testing Tools

Several tools can help you measure LAN speed by sending data between two computers on your network. These tools typically provide detailed throughput statistics such as upload/download speeds, latency, and more. Common tools include:

• iPerf: A powerful tool that measures the maximum TCP and UDP bandwidth between two devices on a LAN. You’ll need to install the tool on two devices to test between them.
  • How to use:
    • Install iPerf on two machines.
    • On one machine, run: iperf -s (to start the server).
    • On the other machine, run: iperf -c [server IP address] (to start the client and test speed).
• LAN Speed Test: An easy-to-use tool that tests both wired and wireless LANs by sending packets of data between computers or network devices.
  • How to use:
    • Download and run LAN Speed Test.
    • Select a shared folder on your network.
    • Run the test to measure read and write speeds.
• TamoSoft Throughput Test: This software measures throughput between two devices using TCP and UDP, providing results for metrics like transfer speeds and packet loss.

2. File Transfer Method

You can also manually measure LAN speed by transferring a large file between two computers and timing the transfer:

• Share a folder on one computer and map it as a network drive on the other.
• Copy a large file (1GB or larger) from one device to the other.
• Use a stopwatch to time the transfer, or use the file transfer window to see the average speed (usually shown in MB/s).
• To convert MB/s to Mbps: multiply by 8. (e.g., 50 MB/s = 400 Mbps)

3. Windows Network Performance Monitor

Windows has a built-in utility called “Resource Monitor” that can show real-time network throughput:

• Press Ctrl + Shift + Esc to open Task Manager.
• Go to the “Performance” tab and select “Open Resource Monitor” at the bottom.
• In the Resource Monitor, go to the “Network” tab to see the throughput of network activity in real-time while transferring files.

4. Network Monitoring Tools

Network monitoring tools can help you analyze LAN traffic and measure network speed over time. These tools often come with more features like bandwidth monitoring, network health reports, and more.

• Wireshark: A network protocol analyzer that captures and displays packets. It won’t directly show throughput, but you can analyze data rates from packet captures.
• PRTG Network Monitor: A comprehensive tool that allows you to monitor traffic on your network, including LAN speed.

5. Router Tools

Some modern routers come with built-in diagnostic tools that can measure LAN speed between connected devices. You can check your router’s admin interface for such tools.

By using one or more of these methods, you should be able to get an accurate measure of your LAN speed and understand how your network is performing.

Some tools that can be use to identify bottleneck on a LAN.

PAESSLER – PRTG

Solarwinds

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