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JPerf is a graphical front end for the popular network

JPerf is a graphical front end for the popular network testing tool Iperf. Using JPerf you can quickly test a WAN or LAN connection to determine the maximum network throughput. The test results are automatically graphed and presented in a format that is easy to read. JPerf can also be used to detect packet loss, delay, jitter, and other common network problems.


JPerf provides many benefits over Iperf which is a command line only application. Besides being reliable and easy to use JPerf is completly free. The utility is fully open source and runs on both Windows or Linux systems.


Installing JPerf on LinuxOn Linux the Java executable must be in your system path, to verify this type java version in a shell.


Next download the JPerf zip file, the same archive is used for Windows or Linux. The folder can be extracted to any location, for example /usr/bin/jperf.


Connecting a client to the serverTo connect to the JPerf server to run a test you'll need to first select the client radio button. In the server address field type in the IP address of the computer running the JPerf server. To begin the test click on run iPerf in the upper right hand corner of the app.


By default JPerf will run a 10 second TCP test using 1 stream. While the test is running the graph will update in real time to reflect the results.


There are several options that can be adjusted to modify the parameters of the test.


Transmit Run the test for a specified number of seconds, or until a certain amount of bytes have been transferred.


Output Format Test results can be changed to display bits, bytes, kbytes, etc.


Report Interval falconsauthenticofficial.com/Prince_Shembo_Jersey_Falcons This adjusts how often the graph results are updated.


Transport layer options


There are several TCP options that can be modified such as buffer length, window size, and MSS. JPerf can also function in UDP mode, although the server must be operating in UDP mode in order for this test to work.


JPerf Tips and TricksBelow are a few useful tips for improving your JPerf results.


Use Parallel streams The bandwidth of a single TCP session is limited by several factors. By using parallel streams you can easily saturate a very high bandwidth connection. In the JPerf client settings you can specify the number of streams to use. I've found 10 to be a good number.


Run a Bi Directional Test By default JPerf transmits data from the client to the server. By selecting the dual testing mode under application layer options JPerf will send data in both directions at the same time.


Use a representative file JPerf has a cool ability that allows you to select a file to be transmitted to the server during the test. This function allows you to simulate a real world data transfer across your network in a controlled manner.


Use JPerf to create iPerf commands Since JPerf uses iPerf as a back end to run all of the tests you can use JPerf to help you build useful iPerf commands. Select the test options you want using the GUI and then copy the command it created from the box at the top of the application.


Expanding Your KnowledgeNow that you are familiar with JPerf I would recomend learning more about iPerf and how to run it from the command line. IPerf is designed for Linux but you can compile IPerf for Windows as well.


JPerf and Iperf tests can be run cross platform, eg: Linux to Windows or vice versa which makes it a highly useful tool for network testing. I've found both of these tools to be indispensable for diagnosing and troubleshooting network problems.

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