iw tools for wireless network

iw dev

iw dev station dump



hwinfo

Wifi: Channel

- wifi umpama hub. satu client hantar signal/gelombang, semua boleh nampak.
- 2 hantar serentak, akan ada gangguan/interference
- CCA(Clear Channel Assessment): semak dulu tiada client lain yg hantar signal, baru hantar. kalau ada, tunggu pada masa yg rawak, baru cuba hantar semula.
- receiver mesti ACK setiap terima signal.




ref:
1- https://commotionwireless.net/docs/cck/networking/learn-wireless-basics/ (good)
2- https://documentation.meraki.com/MR/WiFi_Basics_and_Best_Practices/Channel_Planning_Best_Practices
3- 

connect to wifi wpa2

This doc show how to connect to wpa2 essid using command line

DISABLE NETWORK_MANAGER dulu


 wpa_passphrase SSID PASSWORD > CONFIG_FILE
eg:
# wpa_passphrase myWifi mypassword > wpa.conf


 to list available driver
#      wpa_supplicant



# sudo wpa_supplicant -iwlan0 -c wpa.conf -Dwext
// -i  wireless card
// -c  config file
// -D  driver



ref: http://askubuntu.com/questions/16584/how-to-connect-and-disconnect-to-a-network-manually-in-terminal