Common questions

Does Iperf use TCP or UDP?

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Does Iperf use TCP or UDP?

By default iPerf uses TCP/UDP port 5201/5001 (depending on version) for ports during transfer.

What port does nuttcp use?

For example, if four streams are specified using the default data connection port number, nuttcp will use ports 5001, 5002, 5003, and 5004 for the four TCP (or UDP) connections used to perform the data transfer.

How do I run Iperf UDP test?

Symptoms

  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 port does iperf3 use?

port 5001
By default, the iPerf3 server will listen on port 5001.

What is jitter iperf?

Iperf is a tool to measure the bandwidth and the quality of a network link. – Jitter (latency variation): can be measured with an Iperf UDP test. – Datagram loss: can be measured with an Iperf UDP test. The bandwidth is measured through TCP tests.

What is the maximum window size in TCP?

65,535 bytes
The TCP window size field controls the flow of data and is limited to 2 bytes, or a window size of 65,535 bytes. Since the size field can’t be expanded, a scaling factor is used. TCP window scale is an option used to increase the maximum window size from 65,535 bytes to 1 Gigabyte.

How do you troubleshoot throughput issues?

  1. STEP 1 – Test Throughput using iPerf application (Workstation to Workstation)
  2. STEP 2 – Verify Proper Connectivity and Verify Error Free Interfaces.
  3. STEP 3 – Check Interface Input / Output Rates Along the Path.
  4. STEP 4 – Configured Policies Which Might Affect Traffic.
  5. STEP 5 – Update and Test.

How do I run iperf UDP?

If you want to start iperf Server on UDP Port instead of starting in default TCP Port then you need to use -u option with iperf command as shown below. In this example we are trying to start iperf in Server mode on default UDP Port 5001 using iperf -s -u command.

How do I run iperf client and server?

What data does iperf3 send?

iPerf3 is a tool for active measurements of the maximum achievable bandwidth on IP networks. It supports tuning of various parameters related to timing, buffers and protocols (TCP, UDP, SCTP with IPv4 and IPv6). For each test it reports the bandwidth, loss, and other parameters.

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