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Questions tagged [iperf]

46 questions
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Iperf for Windows - where to find newer versions?

I have just noticed that in openSuse I have iperf version 3.5, where as on Windows I cannot find anything newer then 3.1.3, which dates from June 2016! I still assume that iperf is the most recommended, cross platform, tool to measure network…
Espinosa
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How to perform a network loopback test using TTCP or IPERF?

The PC has two Gigabit Ethernet ports. They function as two separate network adapters. I'm trying to do a simple loopback test between the two. I've tried TTCP and IPERF. They're giving me hard time because I'm using the same physical PC. Using…
Samir
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iperf giving incorrect results

I've just had new broadband installed, and wanted to test its throughput using iperf3. However it appears to be giving considerably different results than more conventional speed tests. E:\tmp> iperf3 -c 3.testdebit.info - - - - - - - - - - - - - -…
Michael B
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iperf returning “bind failed: cannot assign requested address” in Windows XP and 7

I am trying to set up iperf on an old HP server running Windows XP Professional to test multicast, but whenever I issue the command iperf -s -u -B , it returns: bind failed: Cannot assign requested address It doesn't matter what I put…
Liesmith
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Iperf tests in reverse direction

I used iperf to measure the max throughput for TCP connection between two ubuntu machines. Both the machines were directly connected be means of a 1Gbps cable. When I performed iperf tests i obtained a bandwidth of 845 Mbps on an average. But when i…
user3226732
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Windows iperf3 speed test slower than Linux

Hardware setup NAS: Core i3 7100, Intel X540T2 10GbE Switch: Mikrotik CRS305 PC: Ryzen 7 2700, Intel X540T2 10GbE Cables: 2x Cat 7 cables Software Setup NAS: Ubuntu 20.04 alexwang@alex-nas2 ~ (master)> iperf3 --version iperf 3.7 (cJSON…
Alex Wang
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ping works but iperf3 doesn't show any traffic for TCP

machine A has IP (eth0: 192.168.1.1, eth1: 10.10.xxx.yy) machine B has IP (eth0: 192.168.1.2) A and B are connected through RJ5 on eth0, both sides. ping works fine on both side, but when running iperf3 on a client-server mode, it doesn't show any…
iamauser
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How to run IPERF on DD-WRT?

I have IPERF for Windows installed on a desktop computer. Now I want to connect this computer to the router and conduct a simple throughput performance test. For that I will need IPERF running on the router. The router has the Linux based DD-WRT…
Samir
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firewalld Zone "trusted" Drops about 15% of Frames that are Passed by Zone "public"

Background I have two lab machines, which I'll refer to as A and B, running RHEL 8.0. I SSH into A and B from my Windows desktop over a 1 GbE link, whose network interface I'll refer to as eth0. A and B also have a direct 10 GbE fiber link between…
Dave
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iperf3 error exactly 7 seconds into running the test

I am running an iperf test to measure bandwidth from a host iperf client to a container iperf server.Exactly 7 seconds into the test iperf gives an error & abruptly ends the test. The message says " iperf3: error - received an unknown control…
sum1
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iperf3 limiting bandwidth fails

I want to use iperf3 to test some QoS settings of a router. Therefore I want to simulate a lone-lasting but low bandwidth connection.* I tried the following: $ iperf3 -c MYSERVER -b 100K Connecting to host MYSERVER, port 5201 [ 4] local…
masgo
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TCP throughput much better than UDP

I'm monitoring the performances of a WAN link with iperf between two windows machines on both ends. Surprisingly (for me), TCP single session default window reaches a throughput of 12Mbps, while UDP limit (0% packet loss) is about 4Mbps. Bandwidth…
kuma
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Speed over VPN is 10x slower than connection to VPN or VPN<=>Destination

I'm trying to setup VPN for my own use. I have noticed very strange issue with speeds which I struggle to understand. Question: What is causing slow download speed from AWSFrankfurt when using VPN? Setup: [HOME] My ISP home connection with…
Yan
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Why is iPerf UDP bandwidth so much lower that iPerf TCP?

I need to perform a single direction iPerf test. Bi-directionally, using TCP, I get 25Mbps. But single direction using UDP I only get 0.7Mbps. Why is UDP rate so much lower that TCP? iPerf client setting: bin/iperf3.exe -c 10.31.186.128 -u -P 1 -i 1…
Doug Null
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Can I have server and client on the same machine and run network bandwidth test using iperf?

I have two ethernet ports (eth0 and eth1) on my system. I've tested the bandwidth with two systems and got ~940Mbit/s. If I use one of the ports as server and the other as client, I always go through the internal loopback and get really high…
tmp
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