linux commands for wireless network

7/27/2019 Linux Commands for Wireless Network

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8 Linux Commands: To Find Out Wireless Network Speed, Signal Strength And

Other Information

Linux operating systems comes with various set of tools allowing you to manipulate the Wireless

Extensions and monitor wireless networks. This is a list of tools used for wireless network

monitoring tools that can be used from your laptop or desktop system to find out network speed, bit

rate, signal quality/strength, and much more.

#1: Find out your wireless card chipset information

Type the following command to list installed wireless card, enter:

$ lspci$ lspci | grep -i wireless$ lspci | egrep -i --color 'wifi|wlan|wireless'Sample outputs:

0c:00.0 Network controller: Intel Corporation Ultimate N WiFi Link 5300

Please note down the 0c:00.0.

#2: Find out wireless card driver information

Type the following command to get information about wireless card driver, enter:

$ lspci -vv -s 0c:00.0Sample outputs:

0c:00.0 Network controller: Intel Corporation Ultimate N WiFi Link 5300Subsystem: Intel Corporation Device 1121Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-

Stepping- SERR+ FastB2B- DisINTx-Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR-Kernel driver in use: iwlwifi

#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 in this tutorial.

#4: Configure a wireless network interfaceiwconfig command is similar to ifconfig command, but is dedicated to the Linux wireless interfaces.
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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-Hereiwconfig wlan0

Sample outputs:

wlan0 IEEE 802.11abgn ESSID:"nixcraft5g"Mode:Managed Frequency:5.18 GHz Access Point: 74:44:44:44:57:FC

Bit Rate=6 Mb/s Tx-Power=15 dBmRetry long limit:7 RTS thr:off Fragment thr:offEncryption key:offPower Management:off

Link Quality=41/70 Signal level=-69 dBmRx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0Tx excessive retries:0 Invalid misc:28 Missed beacon:0

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 key12.The power management settings

How do I find out link quality?

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 qualitySample outputs:

Link Quality=41/70 Signal level=-69 dBm41/70 is is an aggregate value, and depends totally on the driver and hardware.

How do I find out 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:Link Quality=41/70 Signal level=-69 dBm


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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.

cat /proc/net/wireless

Better use the watch (gnuwatch, bsdwatch) command to run cat command repeatedly, displaying

wireless signal on screen:

watch -n 1 cat /proc/net/wireless

Sample outputs:

Fig.01: Linux watch wireless signal with /proc file system

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.

#6: Gnome NetworkManager

Fig:02: Gnome Network Manger

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 whichprovide 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
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optionally store them in the gnome-keyring.

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. Just type the following command to

see the details:

$ wavemon

Fig.03: wavemon - a wireless network monitor application for Linux

#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 thespecified wireless interface. Sample outputs from iwevents:

Waiting for Wireless Events from interfaces...07:11:57.124553 wlan0 Set Mode:Managed07:11:57.124621 wlan0 Set ESSID:off/any07:12:00.391527 wlan0 Scan request completed07:12:10.428741 wlan0 Scan request completed07:12:10.432618 wlan0 Set Mode:Managed07:12:10.432642 wlan0 Set ESSID:off/any07:12:10.432651 wlan0 Set Frequency:5.18 GHz (Channel 36)07:12:10.432722 wlan0 Set ESSID:"nixcraft5g"07:12:10.647943 wlan0 Association Response

IEs:01088C129824B048606C2D1A7E081BFFFFFF00010000000000C20101000000000000000000003D16240D0000000000000000000000000000000000000000DD007:12:10.648019 wlan0 New Access Point/Cell address:74:44:44:44:57:FC07:12:22.310182 wlan0 Scan request completed
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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:

wlan0 ESSID:"nixcraft5g"

4. iwlist command Get more detailed wireless information from a wireless interface. A typical

usage is as follows:

Usage: iwlist [interface] scanning [essid NNN] [last][interface] frequency[interface] channel[interface] bitrate[interface] rate[interface] encryption[interface] keys[interface] power[interface] txpower[interface] retry[interface] ap[interface] accesspoints

[interface] peers[interface] event[interface] auth[interface] wpakeys[interface] genie[interface] modulation

See also:

man pages iwlist, iw, iwconfig, iwgetid, iwevent, iwlist

Linux wireless wiki
http://linuxwireless.org/http://linuxwireless.org/

linux commands for wireless network

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