What is iPerf3 test?

What is iPerf3 test?

iperf3 is a free open source, cross-platform command-line based program for performing real-time network throughput measurements. It is one of the powerful tools for testing the maximum achievable bandwidth in IP networks (supports IPv4 and IPv6).

Is iPerf3 bidirectional?

All in all, the bidirectional tests between iPerf2 and iPerf3 are very similar. The only advantage of iPerf3 is that it doesn’t require a reverse route or port open to receive the traffic since both sockets are opened from the client to the server.

How do I run iPerf client and server?


  1. Download the iperf utility.
  2. On the server that will be receiving data, open an elevated command window and run the following command: “iperf.exe –s –w 2m”.
  3. On the server that will be sending data, open an elevated command window and run the following command: “iperf –c x.x.x.x –w 2m –t 30s –i 1s”.

What is TCP window size in iPerf?

[TCP Window Size in bits] / [Latency in seconds] = [Throughput in bits per second] The default window size that iPerf uses varies by machine type and operating system. If it’s 64 KBytes, with a modest latency of 10 ms, the maximum bandwidth you can get is 52.43 Mbits/sec. For 500 ms the maximum is 524 Kbits/sec.

Should I use iPerf or iperf3?

iperf3 is a new implementation from scratch, with the goal of a smaller, simpler code base, and a library version of the functionality that can be used in other programs. iperf3 is not backwards compatible with iperf2. x….iperf2 / iperf3.

iperf/iperf3 -c remotehost -i 1 -t 20 -r Run a test from remotehost to localhost

Is iperf3 a TCP?

IPERF3 is a free open-source tool that is widely used for measurements of the maximum achievable throughput between point-to-point connections and it can be used with TCP and UDP protocols.

Does iperf3 support multicast?

For iPerf in UDP server mode, this is also used to bind and join to a multicast group. Use addresses in the range 224.0. 0.0 to 239.255. 255.255 for multicast.

What traffic does iperf send?

iPerf works for both TCP and UDP traffic with certain nuances that pertain to the specifics of each protocol.

Should I use iPerf or iPerf3?

How do I determine TCP window size?

The window scale value can be set from 0 (no shift) to 14. To calculate the true window size, multiply the window size by 2^S where S is the scale value. For Example: If the window size is 65,535 bytes with a window scale factor of 3.