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Questions tagged [iperf]

128 questions
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ieprf vs iperf3 metrics does not match

I am not a network expert but I was measuring the network between to physical hosts using iperf and I got different results depending of the version I was using. Server configuration: CPU: Architecture: x86_64 CPU op-mode(s): …
masber
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Can ARP expire mid iperf connection?

If one runs an iperf connection between a node 'A' and a node 'B' is it possible that the arp entry expires from one of the nodes. [I have a simple mininet topology and while running an iperf connection between two hosts -- one of the arp expires --…
George J. Adams
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iperf bandwidth less than interface speed

I used linux bonding driver to bond 2 NICs in mode 6 in client PC. ethtool ethX shows speed =1000 ethtool bond0 shows speed =2000 but when i use iperf bandwidth of eth0 = 934Mbps bandwidth of eth1 = 637Mbps bandwidth of bond0 = 934Mbps Shouldnt…
Raunak
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What's the operation about iperf udp

I'm trying to doing some bandwidth test by run iperf on my device, My Network Max Bandwith is 100 Mbps (test by speed test CLI - https://github.com/sivel/speedtest-cli) And I ran the iperf UDP bandwidth test (like this $(iperf3 -c $server_ip -u -b…
FaSean Lin
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LACP bond work intermittently on Cisco N5000

Our clients are using Centos 7.1 and 7.3. They are two 10GB card bonded to make a 20GB link. Each of the network card is connected to a pair of Cisco N5000 switch. While running cp or iperf, I can see that sometimes the traffic only flows through…
lbanz
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IPERF 2.0.8/2.0.9 in Windows - "connect failed: Connection refused

I've been using iperf for some time but at present day i need to use the birectional test using -d or -r in the iperf command. The thing is that i always have "Connect failed: Connection refused" when using more than on thread. The scenario is: 2…
Portuguevos
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Iperf3 keeps hanging when running UDP test

I wrote a Python program that runs iperf3 in a for loop with different datagram sizes. I am using Python's subprocess.call function to run iperf3 like this: iperf3 -u -c 185.82.21.60 -b 100M -t 5 -l My datagram size starts with…
arne.z
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How slow can be a QCOW2 vm disk (proxmox/KVM) over NFS (dedicated 1Gbit)?

I'm running 3 proxmox 3.4 nodes using NFS shared storage with a dedicated 1GB network switch. root@lnxvt10:~# pveversion pve-manager/3.4-11/6502936f (running kernel: 2.6.32-43-pve) root@lnxvt10:~# mount | grep…
sgargel
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Why is Apache2 serving as an iperf server?

My Question: Does anybody know why an apache2 server can act as an iperf server? I thought that an apache2 server does only answer HTTP requests. My Situation: I accidentally realized that an apache2 server can act as a iperf server when connecting…
Jimmy88
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Troubleshooting poor point to point (over internet) bandwidth between two machines

My problem started out as poor bandwidth between a 64 bit Win 7 Home OpenVPN server in location A (Northern Europe) and a Win 7 or Linux Client in location B (Southern Europe). Location A has FTTC 70Mbps/20Mbps Location B has FTTH…
Paul Caheny
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Simulation of TX/RX Drop

I'm trying to get the "TX/RX Drop" values to increase. I've tried dropping packets using both iperf and iptables but the statistics aren't increasing even when packets are being dropped. Is there a way of getting these values to increase? Thanks.
supmethods
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Teaming two NIC: iperf shows 200MB/s downloads but only 100MB/s upload

I have: One client with two 1000Mbps NICs, teamed using round-robin method One master with a 10Gbps NIC They are connected with a Huawei 10G switch (S5700). Then I ran iperf -s on master and iperf -c MASTER.IP, it reports bandwidth of 215MB/s, as…
BlahGeek
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my iperf connection test client side keeps showing connection refused

I am trying to setup an iperf test but the client side keeps getting connection refused message. Server side: ubuntu@webserver1:~$ iperf -s ------------------------------------------------------------ Server listening on TCP port 5001 TCP window…
D.Zou
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There's huge gap between two results for iperf

I used iperf -c FOO_NODE -t 120 -i 10 to test the network with the other node FOO_NODE, sometimes I get the result like: [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 3.75 MBytes 3.15 Mbits/sec [ 3] 10.0-20.0 sec 3.75 MBytes …
Tony Han
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Iperf UDP listening on used port

I get WARNING[9157] chan_sip.c: Retransmission timeout reached on transmission error on asterisk and trying to troubleshoot the problem. Now asterisk is listening on 5060 port: udp 0 0 0.0.0.0:10766 0.0.0.0:* …
gilbertasm
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