Linux / Unix: Test Internet Connection Speed From SSH Command

I have recently rented a dedicated server for my hobby projects and learning CentOS Linux server. I was informed that I am connected to the 100M/s port. How do I test my Internet connection download speed from the console over the ssh session without using HTML5 or Adobe flash/Java applets based websites? How do I test my upload speed from the console?

I recommend that you use lftp command to test Internet upload and download speed from console. You can run lftp using the ssh client:

[a] wget command – Retrieves files from the web (download speed test).

[b] wput command – A tiny wget-like ftp-client for uploading files (upload speed test).

[c] axel – Another light download accelerator.

[d] iperf command – Perform network throughput tests.

[c] speedtest-cliCheck the Internet speed with Python based CLI tool called Speedtest-cli.

How To Test Internet Connection Speed From SSH Command on Linux or Unix

You can use the following yum command to install lftp and iperf under RHEL / CentOS / Fedora Linux:
# yum install lftp iperf
OR use the following apt command/apt-get command under Debian or Ubuntu Linux/Mint Linux:
$ sudo apt-get install lftp iperf

Step 1. Find out download url

You need a large size file to test download speed. For example, you can visit the home page of “Linux kernel” to grab Centos Linux ISO file.

Step 2. Use lftp command to test download speed

The syntax is:

lftp -e 'pget; exit; '
lftp -e 'pget; exit; '
lftp -e 'pget; exit; '

Sample outputs:

Fig.01: lftp testing internet speed

You will also get the report as follows:

725617504 bytes transferred in 65 seconds (10.63M/s) 

A note about wget command

You can use the wget command as follows for testing download speed:
$ wget -O /dev/null
Sample outputs:

Fig.02: wget command in action

Step 3. Use lftp command to test upload speed

The sytnax is as follows:

lftp -u userName -e 'put largecd1.avi; bye' 
lftp -u userName,passWord -e 'put largecd1.avi; bye' 
lftp -u userName,passWord -e 'put /path/to/large.iso; bye'

In this example, I am uploading a file to my private ftp server:

lftp -u admin homeserver -e 'cd video; put /home/vivek/Downloads/debian-testing-amd64-CD-1.iso; bye'


lftp -u admin -e 'cd video; put /home/vivek/Downloads/debian-testing-amd64-CD-1.iso; bye'

Sample outputs:

Fig.03: lftp upload speed test in action

How do I test network throughput rate between two Linux or Unix servers?

Consider the following setup:

+------------------+                                  +----------------+
| Linux server A    +--------- ISP Internet-----------+ Linux server B +
+------------------+                                  +----------------+
IP:                                         IP:
iperf server                                          iperf client

Iperf is a tool to measure maximum TCP bandwidth, allowing the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, datagram loss. On server A start iperf as follows:
# iperf -s -B
On server B type the same command as follows:
# iperf -c -d -t 60 -i 10
Sample outputs:

Fig.04: iperf client in action


  1. -s : Run in server mode.
  2. -B IP : Bind to IP, an interface or multicast address.
  3. -c IP : Run in client mode, connecting to IP.
  4. -d : Do a bidirectional test simultaneously.
  5. -t 60 : Time in seconds to transmit for (default 10).
  6. -i 10 : Pause n seconds between periodic bandwidth reports.
Recommended readings

And there you have it. We just test Internet connection speed from SSH command or ssh based session or just old good terminal from your Linux or Unix desktop. See the following man pages for information:
man lftp
man wget
man iperf

Posted by: SXI ADMIN

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.


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