Wireless Signal 2.1

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Linux operating systems come with a various set of tools allowing you to manipulate the Wireless Extensions and monitor wireless networks. Here is a list of Linux tools used for wireless network monitoring tools that can be used from your laptop or desktop system to find out wifi network speed, bit rate, signal quality/strength, and more.

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Linux Commands: To Find Out Wireless Network Speed and Other Info

This page shows how to find the speed of the network interface using various commands on Linux. To see the speed of WLAN interface, one can use iwconfig/iw command, cat command, and 3rd party apps. One can use GUI tools too.

1. Find out your Linux wireless card chipset information

Type the following commands to list installed wireless card using combination of lspci command and grep command/egrep command, enter:
$ lspci
$ lspci grep -i broadcom
$ lspci grep -i wireless
$ lspci egrep -i --color 'wifi wlan wireless'
Sample outputs:

Here is outputs from broadcom based wifi card:

Another outputs:

Please note down the 0c:00.0 or 04:00.0 or 01:00.0 number. You can use those to find out device name or driver name.

2. Find out Linux wireless card driver information

Type the following command to get information about wireless card driver, enter:
$ lspci -vv -s 0c:00.0
Sample outputs:

Another option is to pass the -k option to lspci:
$ lspci -k more
One can use the lshw command to list network devices including Wi-Fi device on Linux:
sudo lshw -C network
Sample outputs:

3. Disabling wireless networking ( Wi-Fi )

You may want to disable Wi-Fi on all laptops as it poses a serious security risk to sensitive or classified systems and networks. You can easily disable Wi-Fi under Linux using the techniques described here.

4. How to configure a wireless network interface on Linux

iwconfig command is similar to ifconfig command, but is dedicated to the Linux wireless interfaces. It is used to manipulate the basic wireless parameters such as ssid, mode, channel, bit rates, encryption key, power and much more. To display information about wlan0 wireless interface, enter:
iwconfig Interface-Name-Here
iwconfig wlan0
Sample outputs:

In the above output iwconfig command shows lots of information:

  1. The name of the MAC protocol used
  2. ESSID (Network Name)
  3. The NWID
  4. The frequency (or channel)
  5. The sensitivity
  6. The mode of operation
  7. Access Point address
  8. The bit-rate
  9. The RTS threshold
  10. The fragmentation threshold
  11. The encryption key
  12. The power management settings

On modern system you may need to use the iw command. If you are using NetworkManager, try the nmcli CLI for controlling NetworkManager including wifi info. To see all connection NetworkManager has:
$ nmcli connection show
Sample outputs:

To see details for “nixcraft” wifi connection, run:
$ nmcli connection show 'nixcraft'
Sample outputs:
To see details for wlp4s0 (wifi) interface; only GENERAL and WIFI-PROPERTIES sections will be shown:
$ nmcli -f GENERAL,WIFI-PROPERTIES dev show wlp4s0
Sample outputs:

How do I find out wifi link quality on Linux?

You can get overall quality of the link. This may be based on the level of contention or interference, the bit or frame error rate, how good the received signal is, some timing synchronisation, or other hardware metric.
# iwconfig wlan0 grep -i --color quality
Sample outputs:

41/70 is is an aggregate value, and depends totally on the driver and hardware. Or use the following command to lists available Wi-Fi access points known to NetworkManager including its speed, security, signal, and more:
$ nmcli dev wifi
Sample outputs:

How do I find out wifi signal level?

To find out received signal strength (RSSI – how strong the received signal is). This may be arbitrary units or dBm, iwconfig uses driver meta information to interpret the raw value given by /proc/net/wireless and display the proper unit or maximum value (using 8 bit arithmetic). In Ad-Hoc mode, this may be undefined and you should use the iwspy command.
# iwconfig wlan0 grep -i --color signal
Sample outputs:

Some parameters are only displayed in short/abbreviated form (such as encryption). You need to use the iwlist command to get all the details.

5. See link quality continuously on screen

You can use /proc/net/wireless file. The iwconfig will also display its content as described above.

Better use the watch (gnuwatch, bsdwatch) command to run cat command repeatedly, displaying wireless signal on screen:

Sample outputs:
Note: Again values will depend on the driver and the hardware specifics, so you need to refer to your driver documentation for proper interpretation of those values.

Autoprompt

Wireless Signal 2.1

6. Using Gnome NetworkManager


Gnome and many other Linux desktop operating system can use NetworkManager to keep an active network connection available at all times. he point of NetworkManager is to make networking configuration and setup as painless and automatic as possible. This package contains a systray applet for GNOME’s notification area but it also works for other desktop environments which provide a systray like KDE or XFCE. It displays the available networks and allows to easily switch between them. For encrypted networks it will prompt the user for the key/passphrase and it can optionally store them in the gnome-keyring. Here is a screenshot of Gnome 3 wifi settings showing WiFi speed and other info:

Please note that NetworkManager is configured through graphical interfaces, which are available for both GNOME and KDE.

7. Say hello to wavemon

wavemon is a ncurses-based monitoring application for wireless network devices. It displays continuously updated information about signal levels as well as wireless-specific and general network information. Currently, wavemon can be used for monitoring devices supported by the wireless extensions, included in kernels version 2.4 and higher.

Install wavemon

Type the following apt-get command/apt command on a Debian/Ubuntu Linux:
$ sudo apt install wavemon

Type the following zypper command on a OpenSUSE/Suse Linux:
$ sudo zypper install wavemon
Type the following yum command on a RHEL/CentOS/Scientific/Oracle Linux (first enable EPEL repo):
$ sudo yum install wavemon
Run the following dnf command on a Fedora Linux:
$ sudo dnf install wavemon
Execute the following pacman command on an Arch Linux:
$ sudo pacman -S wavemon
For Alpine Linux, run apk command as follows:
# apk add wavemon

How do I use wavemon?

Just type the following command to see the details:
$ wavemon

8. Other options

You can use the following tools too:

  1. Wicd which stands for Wireless Interface Connection Daemon, is an open source software utility to manage both wireless and wired networks for Linux.
  2. iwevent command displays Wireless Events received through the RTNetlink socket. Each line displays the specific Wireless Event which describes what has happened on the specified wireless interface. Sample outputs from iwevents:
  3. iwgetid command report ESSID, NWID or AP/Cell Address of wireless network. iwgetid is easier to integrate in various scripts. A sample output from iwgetid command:
  4. iwlist command Get more detailed wireless information from a wireless interface. A typical usage is as follows:

See also:

  • man pages iwlist, iw, iwconfig, iwgetid, iwevent, iwlist
  • See Linux wireless wiki here

Have a favorite wireless tool for Linux? Let’s hear about it in the comments.

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Wireless Signal 2.1 Software

This Wi-Fi network discovery tool displays every wireless hotspot’s MAC address, encryption, signal strength and channel, and is the standard troubleshooting tool for millions of Wi-Fi users throughout the world.

Note: This is the last free version of inSSIDer. You can download the latest version here.

Measure Wi-Fi Signal Strength

inSSIDer for Home helps you measure the signal strength and estimate the performance of your Wi-Fi in various locations. See how walls, stairways, and doors affect your wireless network coverage.

Pick a Better Channel for Your Wi-Fi

All Wi-Fi must share channels with other networks in the environment. Too many networks sharing or overlapping a channel can slow down the performance of all Wi-Fi networks on that channel. This Wi-Fi scanner helps you see the best channel for your Wi-Fi.

Make Sure Your Wi-Fi is Secure

inSSIDer will help you determine which security setting your Wi-Fi is using, reducing the risk of unauthorized access into your home network.

Wireless Signal 2.1 System

Technical Details:

  • Uses your current wireless card and connection software
  • Works with Microsoft Windows Vista, 7, and 8 (32 and 64 bit)
  • Track the strength of received signals in dBm over time
  • Sort by MAC address, SSID, Channel, RSSI, and Time

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