My wifi connection details

Top 3 Commands to check Wifi Information on Ubuntu / Linux – iwconfig, iwlist, nmcli

Getting detailed information about the wifi adapter on a linux system is not straight forward using gui tools.

However there are simple commands that can do the trick.

In this article we shall take a look at commands like iwconfig, iwlist, iw and nmcli which can be used to probe details about the wifi adapter and connection.

1. iwconfig

The iwconfig command is quite similar to the old ifconfig command, but works for wireless connections. Simply running the command without any arguments would show the details of the current wifi connections on the system.

Whether its your system wifi on a laptop or a usb wifi adapter, this command will list them all.

The following is the output on a desktop machine using a usb wifi adapter.

The details include the transfer bit rate, frequency, access point mac address and some other details.

$ iwconfig lo no wireless extensions. enp1s0 no wireless extensions. wlxc025e9177832 IEEE 802.11bgn ESSID:"BsnlDeck" Nickname:"[email protected]>" Mode:Managed Frequency:2.412 GHz Access Point: 80:26:89:C3:6A:CA Bit Rate:150 Mb/s Sensitivity:0/0 Retry:off RTS thr:off Fragment thr:off Power Management:off Link Quality=68/100 Signal level=52/100 Noise level=0/100 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0

Note down the interface name. here it is wlxc025e9177832

The ESSID field tells us the name of the wifi network (here its BsnlDeck) to which the adapter is connected.

Now you can configure the wireless radio transmission power using the iwconfig command like shown below:

$ iwconfig wlxc025e9177832 txpower 30

Here is the output from my Acer Swift 3 laptop showing wifi connection details:

$ iwconfig lo no wireless extensions. wlp0s20f3 IEEE 802.11 ESSID:"AirtelFiber_5GHz" Mode:Managed Frequency:5.745 GHz Access Point: 98:35:ED:D4:E1:4C Bit Rate=390 Mb/s Tx-Power=19 dBm Retry short limit:7 RTS thr:off Fragment thr:off Power Management:on Link Quality=52/70 Signal level=-58 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:10 Missed beacon:0 $

2. iwlist

The next command is iwlist. It lists various supported parameter values by the wifi adapter. For example supported bit rates and supported transmission powers.

Check supported bitrates — This will show the data transfer bitrates supported by the wifi adapter.

$ iwlist wlxc025e9177832 bitrate wlxc025e9177832 4 available bit-rates : 1 Mb/s 2 Mb/s 5.5 Mb/s 11 Mb/s Current Bit Rate:150 Mb/s

3. nmcli

Check status of all network devices — nmcli device status or nmcli dev

$ nmcli device status DEVICE TYPE STATE CONNECTION wlxc025e9177832 wifi connected BsnlDeck enp1s0 ethernet disconnected -- lo loopback unmanaged --

Check details of available wifi networks that can be joined.

$ nmcli dev wifi IN-USE BSSID SSID MODE CHAN RATE SIGNAL BARS SECURITY 98:35:ED:D4:E1:48 AirtelFiber Infra 5 130 Mbit/s 75 ▂▄▆_ WPA1 WPA2 * 98:35:ED:D4:E1:4C AirtelFiber_5GHz Infra 149 270 Mbit/s 63 ▂▄▆_ WPA1 WPA2 60:63:4C:84:15:AA dlink-15A3 Infra 4 270 Mbit/s 47 ▂▄__ WPA1 WPA2 0C:80:63:76:5F:90 Krishna Infra 9 405 Mbit/s 40 ▂▄__ WPA2 14:CC:20:A5:70:48 Camp Nou Infra 9 54 Mbit/s 35 ▂▄__ WPA2 84:D8:1B:00:7A:7C subash Infra 10 270 Mbit/s 35 ▂▄__ WPA2 AC:84:C6:F4:60:18 TP-Link_6018 Infra 11 270 Mbit/s 34 ▂▄__ WPA2 18:A6:F7:3C:F8:1C Risha Infra 6 135 Mbit/s 27 ▂___ WPA2 34:0A:33:68:5C:E6 neymarjr Infra 13 270 Mbit/s 15 ▂___ WPA2 $

Other examples

1. Check transmission power of wifi adapter

Use the iwlist command to check the transmission power of the wifi adapter. It will display the power in decibels-milliwatts and milliwatts as well.

$ sudo iwlist wlp0s20f3 txpower

$ sudo iwlist wlp0s20f3 txpower wlp0s20f3 unknown transmit-power information. Current Tx-Power=21 dBm (125 mW) $

$ iwlist wlx74da38e88bd7 txpower wlx74da38e88bd7 unknown transmit-power information. Current Tx-Power=20 dBm (100 mW)

2. Change transmission power of wifi adapter

Now use the iwconfig command to change the radio transmission power

$ sudo iwconfig wlx74da38e88bd7 txpower 10 [email protected]:~$ iwlist wlx74da38e88bd7 txpower wlx74da38e88bd7 unknown transmit-power information. Current Tx-Power=10 dBm (10 mW) $

$ sudo iwconfig wlx74da38e88bd7 txpower 3 $ iwlist wlx74da38e88bd7 txpower wlx74da38e88bd7 unknown transmit-power information. Current Tx-Power=3 dBm (1 mW)

The above command works for a variety of wifi chipsets including onboard intel wifi chipsets in laptops as well as chipsets in usb wifi adapters.

3. Get details of usb wifi adapter

The lsusb command will show all usb devices including the wifi adapter

$ lsusb Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 045e:00cb Microsoft Corp. Basic Optical Mouse v2.0 Bus 001 Device 003: ID 22b8:2e82 Motorola PCS Bus 001 Device 002: ID 413c:2107 Dell Computer Corp. Bus 001 Device 006: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS] Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

In the above output the line «Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]» is the usb wifi adapter.

4. Check the loaded driver modules

To check what drivers are currently loaded to operate the wifi driver, use the lsmod command and grep for wifi.

$ lsmod | grep -i wifi rtlwifi 77824 3 rtl8192c_common,rtl_usb,rtl8192cu mac80211 778240 4 rtl_usb,rtl8192cu,rtlwifi,rtl8xxxu cfg80211 622592 2 rtlwifi,mac80211

5. Get lots of detail about wifi adapter

The iw list command shows a huge amount of hardware information about the wifi adapter.

Links and Resources

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Analyze the wireless network report

The wireless network report is one of the more useful tools in Windows 10 that can help you diagnose Wi-Fi connection problems.

To create the wireless network report

1. In the search box on the taskbar, type Command prompt, press and hold (or right-click) Command prompt, and then select Run as administrator >Yes.
2. At the command prompt, type netsh wlan show wlanreport.

The wireless network report contains the following sections:

• Wi-Fi summary chart. This chart shows the Wi-Fi connection sessions that are available in the report. Select a section in the chart to go to the corresponding Wi-Fi session shown in the report. A red circle indicates an error. If you see one, select it to get info about the error.
• Report Info. Shows the date the report was created and how many days it covers.

General System Info. Contains details about your PC. It includes the computer name, system manufacturer, system product name, BIOS date, BIOS version, OS build, Machine ID, and info about if it’s MDM joined.

User Info. Contains general information about the person who is currently signed in to the PC. It contains:

• Username. Current user signed in to the PC.
• User Domain. The domain the PC is joined to.
• User DNS Domain.

Network adapters. Contains a detailed list of all the network adapters on your PC. This includes any hidden adapters.

• Device. This is the friendly name of the adapter.
• PnP ID. The PnP ID the PC uses to identify the adapter.
• Guid. The Unique identifier of this adapter on your PC.
• Current driver version. Current driver version the adapter is using.
• Driver date. The date the driver was installed.
• DevNode flags.
• Problem number. If there’s a problem with your adapter, the problem number will be listed here.

  

Script output

IPConfig /all. Shows detailed information about the state of the adapters on the system. This includes the physical (MAC) address, IP address, DNS server, if DHCP is enabled, and much more.




NetSh WLAN Show All. Shows detailed information about your Wi-Fi adapter including the adapter’s capabilities, the Wi-Fi profiles on your PC (not including security keys or passwords), and a list of the Wi-Fi networks that were found when you ran the report.




CertUtil -store -silent My & certutil -store -silent -user My. Contains a list of the current certificates on your PC.




Profile Output. A detailed list of all the Wi-Fi profiles stored on your PC. Security keys and passwords are encrypted and aren’t displayed.

Summary

Session Success/Failures. Summary of the successes, failures, and warnings that are reported for the different Wi-Fi sessions.




Disconnect Reasons. Lists the different reasons you were disconnected from the Wi-Fi network.




Session Durations. A chart that shows how long each of the following sessions lasted.



• Wireless Sessions. All the Wi-Fi events associated with each Wi-Fi session.
  • Interface name. Friendly name for the adapter.
  • Interface Guid. Unique identifier for the adapter.
  • Connection Mode. How your device connected to the network—Manual, Auto with a profile, and so forth.
  • Profile. Profile used in the connection (when a profile is used).
  • SSID. The name of the Wi-Fi network.
  • BSS Type. Type of network—Infrastructure, Independent (adhoc), or any (either Infrastructure or Adhoc).
  • Session Duration. How long the session lasted.
  • Disconnection Reason. Reason why you were disconnected.
  • Events. All the Wi-Fi events for this session. To get more info about an event, select it. These events are color coded and can help you to diagnose problems. The summary chart has a definition for each of the different colors.
    

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