4
2009
Testing Tool and Procedure Example using IPerf and JPerf
How Fast is My Point to Point Connection Really Running. How to Test and With What.
Test Tools and Application procedure demonstrated and explained to see how fast your internal network and equipment is passing Data.
Have you ever wonder how the performance on your home network is and is there anyway you can measure the performance? Here is a surefire method to test and ensure the speeds you are achieving on your network is accurate. This tool is both ideal and great for our clients and anyone to use when testing the equipment they have. From Ethernet Extenders, Media Converters or DSLAMs this tool and this blog write up will assist you on testing your speeds and performance.
Imagine if you have just installed a new Wireless Access Point or Ethernet Extender or maybe a new Switch on your network. You felt the new hardware is slow or not up to speed. How do you tell if it is the gear or other factors like poor wiring or connection or noise?
JPerf is a great network performance measuring tool and JPerf has a great Java based GUI that is free and open sourced. You can download these applications and programs here.
JPerf must be running on both test PCs or laptops in order to test the network performance in between. One PC must be running Server mode in the JPerf and the other PC running Client mode in JPerf.
The software is Java-based, you might need to download the latest Java Runtime app from www.java.com
Both PC in the testing must be on a static IP that is different like the example showed below. It must be under the same subnet if you are running this test as well. For this example we will use our popular Ethernet Extender the VX-VEB160R2.
Example, Server IP: 192.168.0.1 Client IP: 192.168.0.2
Main Window of JPerf.
Please enter the Server IP address on the Client mode PC.
You need to change the TCP Window Size to 64Kbytes on both Server and Client for better result.
You can change the testing time from 10 seconds to any other time if you want longer or shorter testing time.
You can change the Output Format for the different output result in the bandwidth chart. Change the Output to MBits for testing Ethernet speed. Please do not select Megabytes as that is a common mistake and will not suffice.
To test data flow and speeds coming back and forth you can toggle the Trade function which will then report speeds heading to and coming from on laptop to the other.
Change the Testing mode to Trade if you want to test both Upload and Download speed. See the picture below for an example of the VX-VEB160R2 testing speeds coming both ways.
Click on the 
on the Server mode PC first.
Then click on the same on the Client mode PC to start the test.
To stop the testing, click on the 
to stop the test.
There you have it. Using these tool you can easily troubleshoot and ensure that your device or network is running properly and the speeds are meeting your expectation.
Hey, great post, really well written. You should post more about this.
hi!! i’m really interest using this network tool. And i’m want to explore more deeply about potential ability from jperf to measure network quality.
can you explain to me (more deeply) about “Representative file” option (upper Print MSS menu at application layer option)?! what the function of this menu?
is that jperf really can do multicast? if yes, what i’m suppose to do, so I can do multicast on jperf?!
I hope you can and want to answer this question!! I really-really hope your answer. Because I want use it to measure my network using many router, many parameter input, etc.
Thank you very much for your attention.
hi,my name is ryan.I am a student from japan.I try to measure the max speed of LAN cable from Server to client PC with setting the UDP protocol.But i dun know what is relate between the UDP bandwidth,UDP buffer Size,and UDP packet size.Is that 3 setting will influence the Max speed than i wan measure?If yes,how can i set the value?
Please help me as soon as possible.Thanks you here.
i hope can hear you soon.