How fast is my network really? Not just ping - actual throughput.
Aug 11, 2026
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by John Britto
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1 min read
Quick Linux Tip #34 :
Try: iperf3 -c 192.168.1.100
Info: iperf3 measures real TCP/UDP throughput. Run iperf3 -s on the server and iperf3 -c <SERVER_IP> on the client.
Examples:
$ iperf3 -s # Server mode (run first)
$ iperf3 -c server -u -b 1G # UDP test at 1 Gbps
$ iperf3 -c server -R # Reverse mode (test download speed)
Note: Install via apt install iperf3. Ensure port 5201 is open. A non-zero Retr column indicates packet loss/congestion.
LinuxTeck.com
linuxteck@ubuntu:~$ iperf3 -c 192.168.1.100
Connecting to host 192.168.1.100, port 5201
[ 5] local 192.168.1.50 port 54321 connected to 192.168.1.100 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 112 MBytes 940 Mbits/sec 0 1.05 MBytes
[ 5] 1.00-2.00 sec 111 MBytes 931 Mbits/sec 0 1.05 MBytes
[ 5] 2.00-3.00 sec 112 MBytes 940 Mbits/sec 0 1.05 MBytes
[ 5] 3.00-4.00 sec 111 MBytes 931 Mbits/sec 0 1.05 MBytes
-----------------------------------------------------------
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-10.00 sec 1.09 GBytes 937 Mbits/sec 0 sender
[ 5] 0.00-10.00 sec 1.09 GBytes 935 Mbits/sec receiver
linuxteck@ubuntu:~$
About John Britto
John Britto Founder & Chief-Editor @LinuxTeck. A Computer Geek and Linux Intellectual having more than 20+ years of experience in Linux and Open Source technologies.
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