Wifi
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References
Wifi tools
iw
To be completed.
iwconfig
iwconfig, get information or configure a wireless network interface
# iwconfig is in /sbin. Either give full path or use sudo
/sbin/iwconfig # Get information
sudo iwconfig # Get information
Example of information returned by iwconfig:
iwconfig
# enp0s31f6 no wireless extensions.
#
# wlp1s0 IEEE 802.11 ESSID:"ManticoreNet"
# Mode:Managed Frequency:5.18 GHz Access Point: 38:2C:4A:A3:62:37
# Bit Rate=240 Mb/s Tx-Power=22 dBm
# Retry short limit:7 RTS thr:off Fragment thr:off
# Encryption key:off
# Power Management:on
# Link Quality=49/70 Signal level=-61 dBm
# Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
# Tx excessive retries:0 Invalid misc:56 Missed beacon:0
#
# lo no wireless extensions.
Note that the Link quality and signal level is also available in /proc/net/wireless:
cat /proc/net/wireless
# Inter-| sta-| Quality | Discarded packets | Missed | WE
# face | tus | link level noise | nwid crypt frag retry misc | beacon | 22
# wlp1s0: 0000 49. -61. -256 0 0 0 0 58 0
iwlist
iwlist, get more detailed wireless information from a wireless interface
sudo iwlist scan
sudo iw dev wlan0 scan # wlan0 or wlp1s0 or ...
nmcli
nmcli can set and query wifi devices and wifi connections.
nmcli d wifi
# IN-USE SSID MODE CHAN RATE SIGNAL BARS SECURITY
# ManticoreNet Infra 1 270 Mbit/s 72 ▂▄▆_ WPA2
# * ManticoreNet Infra 36 405 Mbit/s 62 ▂▄▆_ WPA2
# WiFi-5.0-C1C3 Infra 108 540 Mbit/s 60 ▂▄▆_ WPA2
# WiFi-2.4-C1C3 Infra 6 54 Mbit/s 57 ▂▄▆_ --
rfkill
rfkill, show state of RF SW/HW kill switch (WiFi / BT / ...)
rfkill list all
If using Network Manager:
nmcli connection show
# NAME UUID TYPE DEVICE
# testing 1eba2547-2cc2-4785-9288-f205aa6f533d wifi wlp1s0
nmcli connection show "testing"
nmcli -f GENERAL,WIFI-PROPERTIES dev show wlp1s0
Utilities
Wavemon
See Linux commands.
Wifi PEAP
Linux Access Point
You can turn your laptop into a WiFi access point, provided of course that your WiFi card supports that feature:
sudo service network-manager stop
sudo iwconfig wlan0 mode master
If you get the following error then most probably it is not supported:
Error for wireless request "Set Mode" (8B06) :
SET failed on device wlan0 ; Invalid argument.
Turn NetworkManager back on:
sudo service network-manager start
Some links:
Troubleshoot wifi
# Check device
lsusb # if wifi usb device
lspci # if wifi pci device
lspci | egrep -i 'wifi|wlan|wireless'
# Check if device has an interface
iwconfig
# Check status interfaces
ifconfig
# Check signal quality
sudo iwconfig wlp1s0|grep -i quality
# Link Quality=52/70 Signal level=-58 dBm
nmcli dev wifi
# IN-USE SSID MODE CHAN RATE SIGNAL BARS SECURITY
# testing Infra 13 270 Mbit/s 70 ▂▄▆_ WPA2
watch -n 1 cat /proc/net/wireless
# Inter-| sta-| Quality | Discarded packets | Missed | WE
# face | tus | link level noise | nwid crypt frag retry misc | beacon | 22
# wlp1s0: 0000 52. -58. -256 0 0 0 0 182 0
# Get available WiFi connections
nmcli c[onnection]
# Get Wifi Status
nmcli r[adio]
# If Wifi is down, turn it on:
nmcli r wifi on
Wifi is either controlled by NetworkManager or via the command line.
- NetworkManager
- Command file
- See file /etc/network/interfaces. See man page
man interfaces - For WPA, see file /etc/wpa_supplicant/wpa_supplicant.conf.
- Miscellaneous
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- See Common Issues