How to test ethernet speed with iperf

Submitted by root on Fri, 07/18/2014 - 00:40

In the following example, I am testing the speed between two virtualbox debian machines, both with Intel Pro/1000 MT Server (82545EM) virtual ethernet adapters.

1. open iperf with `-s` option to one of the servers:

NOTE: iperf will remain open until you type ctrl+c

root@pluto:~# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 16.0 MByte (default)
------------------------------------------------------------

2. Run iperf with `-c IP` against the server from point 1:

[root@sun] ~# iperf -c 192.168.69.8
------------------------------------------------------------
Client connecting to 192.168.69.8, TCP port 5001
TCP window size: 35.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.69.1 port 41076 connected with 192.168.69.8 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  1.10 GBytes   944 Mbits/sec

On the 1st server you should see iperf writing forward (green output):

root@pluto:~# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 16.0 MByte (default)
------------------------------------------------------------
[color=green][  4] local 192.168.69.8 port 5001 connected with 192.168.69.1 port 41076
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  1.10 GBytes   941 Mbits/sec[/color]

Thou shalt not steal!

Or at least link back to this website.

Recent content

How to repair a sparsebundle image root
macOS: How to Show and Hide Hidden Files in macOS Finder root
Samsung 870 QVO 2TB: Speed Tests and comparison with Adata SU650 and Kingston K600 root
Ubiquiti EdgeRouter X - thoughts and tips root
Qnap TR-004 short review - why I cannot use it root
Speed test of Icy Box IB-3805-C31, a 5 disks enclosure from Raidsonic root
Asus ROG Sheath in 2024: a HUGE Mousepad, Bigger Than Logitech G840 XL root
Debian DRBD: How to resize drbd and OCFS2 online root
Ubuntu: Fast Install With VMware Fusion root
The one with APC Back-UPS BE850G2-GR: Charge Whatever With It, From Phone to Computer And BEYOND :D root
File Sharing Problems? Downgrade from macOS Ventura to Monterey root
VIOFO A139 Quad HD Dash Camera - 3 Channels Camera in a 2 Channels Package. Confused? root
CarPlay not working with iPhone 15 Pro? Seven Type C cables tested with Mazda 3 BP with USB-A Port root
Apple Watch Series 9? Not Yet! I Still Love My "Seven of Nine" 19 months later root
The Wooden Playhouse Project root
ESXi 7: Create VMFS Partition Via Command Line root
5 Months with iPhone 15 Pro: Not PERFECT But... Must See. From Gaming to ProRes Requirements. root
How to build a 25U 600x600 Server Rack root
Thermaltake Pure 20 fan - HUGE and quiet! root
Docker: how to increase php memory "the docker way" root
Mousepad Logitech G840 root
Global Chip Shortage? Build this oddity: PC From 2009 With GeForce GTX 1050ti 4G root
Brigadier: How to use it to Download Boot Camp Drivers root
Bombardier: How to use it to Download Boot Camp Drivers root
Logitech Pro X Wired Gaming Headset (2nd gen): review + mic test with G HUB on Windows 11 and macOS root
macOS: extract user's image root
EA Sports WRC Time Trial Locations and Stages root
Who Said GPTK is Hard to Get? A Walkthrough Installing GPTK On macOS Sonoma \| Whisky: a neat UI that integrates GPTK, Wine and a bit of CrossOver root
macOS: create a password protected zip file (archive) root
MacPorts: The Xcode Command Line Tools package appears to be installed, but its receipt appears to be missing. root