How to install and use iPerf


How to install and use iPerf

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What is iPerf?

iPerf is an open source network performance tool. It creates TCP and UDP network streams between hosts and counts the maximum bandwidth used in the connection which is then reported to the user.

It is a fantastic tool for measuring network speed and capacity and is quite straight forward to use. For further in depth reading on iPerf please use the following resource iPerf FAQ

iPerf vs iPerf3…what is the difference?

Without confusing matters too much iPerf that is used today is actually iPerf2 but referred to as simply iPerf. iPerf3 was built from scratch in 2014 from the original code. iPerf3 has Linux and Windows variants whereas iPerf is only available for Linux.

How do I use iPerf/iPerf3?

Firstly you must install iPerf on your operating system:

yum install iperf

apt-get install iperf

Once installed you can then run tests to an iPerf server. We have over 100 instances of iPerf running here at fractionservers for you to test:

iperf: with ports 5100 to 5200 usable
iperf3: with ports 5300 to 5350 usable

To perform a test to our iPerf server (remember you can use any port from 5100 to 5200):
iperf -c -p 5100

To perform a test to our iPerf3 server (remember you can use any port from 5300 to 5350):
iperf3 -c -p 5300

The output of the test will be similar to the following and will report back the speed achieved during the test

Client connecting to, TCP port 5100
TCP window size: 45.0 KByte (default)
[  3] local port 50616 connected with port 5100
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.1 sec  1.27 GBytes  1.08 Gbits/sec

Here we can see 1.27GBytes was transferred within 10 seconds and the maximum bandwidth achieved would be 1.08Gb/s

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