If you've been given a new dedicated server from a New Dedicated-Server-Provider or VPS with Linux and you were told that a certain download speed to the Server is guaranteed from the server provider, in order to be sure the server's connection to the Internet told by service provider is correct it is useful to run a simple measurement console test after logging in remotely to the server via SSH.
Testing connection from Terminal is useful because as you probably know most of Linux / UNIX servers doesn't have a GUI interface and thus it is not possible to test Internet Up / Down Bandwidth through speedtest.net.
1. Testing Download Internet Speed given by ISP / Dedi-Server Provider from Linux Console
For the download speed (internet) test the historical approach was to just try downloading the Linux kernel source code from www.kernel.org with some text browser such as lynx or links count the seconds for which the download is completed and then multiple the kernel source archive size on the seconds to get an approximate bandwidth per second, however as nowdays internet connection speeds are much higher, thus it is better to try to download some Linux distribution iso file, you can still use kernel tar archive but it completed too fast to give you some good (adequate) statistics on Download bandwidth.
If its a fresh installed Linux server probably you will probably not have links / elinks and lynx text internet browers installed so install them depending on deb / rpm distro with:
If on Deb Linuz distro:
root@pcfreak:/root# apt-get install –yes links elinks lynx
On RPM Based Linuz distro:
[root@fedora ~]# yum install -y lynx elinks links
Conduct Internet Download Speed with links
root@pcfreak:/root# links https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.19.1.tar.xz
(Note that the kernel link is current latest stable Kernel source code archive in future that might change, so try with latest archive.)
You can also use non-interactive tool such as wget, curl or lftp to measure internet download speed
To test Download Internet Speed with wget without saving anything to disk set output to go to /dev/null
root@pcfreak:~# wget -O /dev/null http://pc-freak.net/~hipo/hirens-bootcd/HirensBootCD15/Hirens.BootCD.15.0.zip
You see the Download speed is 104 Mbit/s this is so because I'm conducting the download from my local 100Mbit network.
For the test you can use my mirrored version of Hirens BootCD
2. Testing Uplink Internet speed provided by ISP / Server Provider from Linux (SSH) Console
To test your uplink speed you will need lftp or iperf command tool.
root@pcfreak:~# apt-cache show lftp|grep -i descr -A 12
Description: Sophisticated command-line FTP/HTTP client programs
Lftp is a file retrieving tool that supports FTP, HTTP, FISH, SFTP, HTTPS
and FTPS protocols under both IPv4 and IPv6. Lftp has an amazing set of
features, while preserving its interface as simple and easy as possible.
The main two advantages over other ftp clients are reliability and ability
to perform tasks in background. It will reconnect and reget the file being
transferred if the connection broke. You can start a transfer in background
and continue browsing on the ftp site. It does this all in one process. When
you have started background jobs and feel you are done, you can just exit
lftp and it automatically moves to nohup mode and completes the transfers.
It has also such nice features as reput and mirror. It can also download a
file as soon as possible by using several connections at the same time.
root@pcfreak:/root# apt-cache show iperf|grep -i desc -A 2
Description: Internet Protocol bandwidth measuring tool
Iperf is a modern alternative for measuring TCP and UDP bandwidth performance,
allowing the tuning of various parameters and characteristics.
To test Upload Speed to Internet connect remotely and upload any FTP file:
root@pcfreak:/root# lftp -u hipo pc-freak.net -e 'put Hirens.BootCD.15.0.zip; bye'
On Debian Linux to install iperf:
root@pcfreak:/root# apt-get install –yes iperf
On latest CentOS 7 and Fedora (and other RPM based) Linux, you will need to add RPMForge repository and install with yum
[root@centos ~]# rpm -ivh rpmforge-release-0.5.3-1.el7.rf.x86_64.rpm
[root@centos ~]# yum -y install iperf
Once having iperf on the server the easiest way currently to test it is to use
serverius.net speedtest server – located at the Serverius datacenters, AS50673 and is running on a 10GE connection with 5GB cap.
root@pcfreak:/root# iperf -c speedtest.serverius.net -P 10
Client connecting to speedtest.serverius.net, TCP port 5001
TCP window size: 16.0 KByte (default)
[ 12] local 18.104.22.168 port 54258 connected with 22.214.171.124 port 5001
[ 7] local 126.96.36.199 port 54252 connected with 188.8.131.52 port 5001
[ 5] local 184.108.40.206 port 54253 connected with 220.127.116.11 port 5001
[ 9] local 18.104.22.168 port 54251 connected with 22.214.171.124 port 5001
[ 3] local 126.96.36.199 port 54249 connected with 188.8.131.52 port 5001
[ 4] local 184.108.40.206 port 54250 connected with 220.127.116.11 port 5001
[ 10] local 18.104.22.168 port 54254 connected with 22.214.171.124 port 5001
[ 11] local 126.96.36.199 port 54255 connected with 188.8.131.52 port 5001
[ 6] local 184.108.40.206 port 54256 connected with 220.127.116.11 port 5001
[ 8] local 18.104.22.168 port 54257 connected with 22.214.171.124 port 5001
[ ID] Interval Transfer Bandwidth
[ 9] 0.0-10.2 sec 4.05 MBytes 3.33 Mbits/sec
[ 10] 0.0-10.2 sec 3.39 MBytes 2.78 Mbits/sec
[ 11] 0.0-10.3 sec 3.75 MBytes 3.06 Mbits/sec
[ 4] 0.0-10.3 sec 3.43 MBytes 2.78 Mbits/sec
[ 12] 0.0-10.3 sec 3.92 MBytes 3.18 Mbits/sec
[ 3] 0.0-10.4 sec 4.45 MBytes 3.58 Mbits/sec
[ 5] 0.0-10.5 sec 4.06 MBytes 3.24 Mbits/sec
[ 6] 0.0-10.5 sec 4.30 MBytes 3.42 Mbits/sec
[ 8] 0.0-10.8 sec 3.92 MBytes 3.03 Mbits/sec
[ 7] 0.0-10.9 sec 4.03 MBytes 3.11 Mbits/sec
[SUM] 0.0-10.9 sec 39.3 MBytes 30.3 Mbits/sec
You see currently my home machine has an Uplink of 30.3 Mbit/s per second, that's pretty nice since I've ordered a 100Mbits from my ISP (Unguaranteed Bandwidth Connection Speed) and as you might know it is a standard practice for many Internet Proviers to give Uplink speed of 1/4 from the ISP provided overall bandwidth 1/4 would be 25Mbi/s, meaning my ISP (Bergon.NET) is doing pretty well providing me with even more than promised (ordered) bandwidth.
Iperf is probably the choice of most sysadmins who have to do regular bandwidth in local networks speed between 2 servers or test Internet Bandwidth speed on heterogenous network with Linux / BSDs / AIX / HP-UX (UNIXes). On HP-UX and AIX and other UNIXes for which iperf doesn't have port you have to compile it yourself.
If you don't have root /admin permissions on server and there is python language enterpreter installed you can use speedtest_cli.py script to test internet throughput connectivity
speedtest_cli uses speedtest.net to test server up / down link just in case if script is lost in future I've made ownload mirror of speedtest_cli.py is here
Quickest way to test net speed with speedtest_cli.py:
$ lynx -dump https://raw.github.com/sivel/speedtest-cli/master/speedtest_cli.py > speedtest_cli.py
$ chmod +x speedtest_cli.py