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Questions tagged [iperf3]

iperf is a network testing tool for performance and tuning that can create TCP and UDP data streams and measure the throughput of a network that is carrying them.

iperf is a network testing tool for performance and tuning that can create TCP and UDP data streams and measure the throughput of a network that is carrying them.

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How to make tee in Linux provide screen output line by line, not at the end of execution?

I'm using iperf3 in Ubuntu 20. When not writing to a log file, iperf3 can provide a report every second with the -i 1 option. Using the --logfile option redirects all output to the file and inhibits any terminal output. One way to get both terminal…
tim11g
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How to embed a custom header in packets that are sent by iperf command?

I am an iperf newbie. I want add custom header with minimal data in the packets that are sent by iperf tool. Is it even possible? If yes, can someone please enlighten me :)
Gurupad Hegde
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Powershell - Try Catch - Non Powershell Errors

Is it possible to create a try-catch that catches a non-Powershell cmdlet error? Example Error: iperf3: error - unable to connect to server: Connection timed out I want to catch that error and then try a different server for redundancy. Thank you…
Jonathan-Ball
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iperf2 latency is a two way or one way latency

iperf2 (version 2.0.9) reports latency in its output as shown below. Is it a two-way latency or one-way latency measurement ? Server listening on UDP port 5001 with pid 5167 Receiving 1470 byte datagrams UDP buffer size: 208 KByte (default) [ 3]…
Hanamantagoud
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Iperf tool cannot set one larger socket buffer

Recently I try Iperf3 to test our system's throughput. I want to set tcp's window size to 2M, but failed. iperf3 -c 135.242.61.60 -w 2M Connecting to host 135.242.61.60, port 5201 iperf3: error - socket buffer size not set correctly I check iperf3's…
Johnson_linux
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What are the default iperf3 values?

From: https://www.mankier.com/1/iperf3#--length I can only see: length of buffer to read or write. For TCP tests, the default value is 128KB. Q: But what sizes do iperf use to test the connection between the nodes? Cannot find any DOC about…
HolcombSimons
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python compute bandwidth, error packet rate and transfer rate between a client and a server app

I am developing the python code for a client and a server. This code must mimic the transmission of a stream (UDP stream) from server one or more clients , while each client has to compute some "metrics"about it, such as bandwidth, packet error rate…
FraD
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Ending iperf3 server

based off this answer, how can this be done in iperf3. Going through the iperf3 man page and documentation, it seems that the -t option no longer exists. What other ways can I implement to kill the server process after some duration or if no…
user2883071
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i have installed iperf3 when i use iperf3 with server mode i am getting the following error libcrypto.so.1.1 not found

i have installed iperf3 in fedora 15 . When I used "iperf -u -s -V" the following error is shown "iperf3: error while loading shared libraries: libcrypto.so.1.1: cannot open shared object file: No such file or directory" I have tried to install…
Vinayak Hosamani
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Measure TCP thruoghput while streaming video

I am trying to measure TCP throughput using Iperf3 tool. What I am doing is this: 1- open three connections in iperf, -each with different client- for 900 seconds (the time of video) 2- run VLC to stream video from those 3 clients( this is done…
M.salameh
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Iperf3 Jitter Value Way Too High

I was running an UDP test and I noticed that the jitter value was way too high, is something not initialized properly in iperf3 source code? The connection between client and server is very good. Maybe the reason for high jitter was that…
user8970869
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Can't connect to iperf3 running in Azure Container Instances

trying a quick experiment with ACI to see if I can use it to host iperf3 for some on demand network performance testing. The docker image is https://hub.docker.com/r/netgio/iperf3server/ I can get the container up and running but when I try to…
Netgio
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Iperf3 Optimum Settings For Testing General Browsing Performance

Iperf3 is a great tool and is seen as the gold standard in terms of testing network performance however its enormous scope of functionality makes it difficult to configure for specific use cases. What are the best settings to configure at both…
Paula Livingstone
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iperf trafic generator via 2 NIC's using Dispatch Proxy

I am attempting to run a test between two machines running windows 7 connected to an access point (isolated from any other network). I need to split traffic from a traffic generator like Iperf3 between 2 Network Interfaces (WIFI) connected to the…
Gui
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What algorithm iperf3 use under the hood to measure the bandwidth and latency between end to end points in a network infrastructure?

I am trying to learn an iperf tool, which is a handy tool to measure the bandwidth and latency of two endpoints on a network. I am wondering which algorithm does iperf/iperf3 use under the hood to measure the latency and bandwidth. I go through the…
shining
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