wpa_supplicant is a Wifi supplicant to handle authentication.
|ap||No||Add support for access point mode|
|dbus||Yes||Enable dbus support for anything that needs it (gpsd, gnomemeeting, etc)|
|eap-sim||No||Add support for EAP-SIM authentication algorithm|
|fasteap||No||Add support for FAST-EAP authentication algorithm|
|gnutls||No||Adds support for net-libs/gnutls (TLS 1.0 and SSL 3.0 support)|
|p2p||No||Add support for Wi-Fi Direct mode|
|ps3||No||Add support for ps3 hypervisor driven gelic wifi|
|qt4||Yes||Adds support for the Qt GUI/Application Toolkit version 4.x|
|readline||Yes||Enables support for libreadline, a GNU line-editing library that almost everyone wants|
|selinux||No||!!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur|
|smartcard||No||Add support for smartcards|
|ssl||Yes||Adds support for Secure Socket Layer connections|
|wimax||No||Add support for Wimax EAP-PEER authentication algorithm|
|wps||No||Add support for Wi-Fi Protected Setup|
Netifrc setup for wlan0
After configuration below, you might want to change the permissions to ensure that WiFi passwords can't be viewed in plaintext by anyone using the computer:
The simplest way to configure wpa_supplicant is by using its simple (but sufficient for most uses) user interface called wpa_gui. To enable it, build wpa_supplicant with the the qt4 USE flag enabled.
To allow unprivileged users to control the connection using wpa_gui, add the following at the beginning of your /etc/wpa_supplicant/wpa_supplicant.conf:
wpa_supplicant can be configured manually. This can be fine if the computer does not need to connect to many different access points.
Examples can be found in the wpa_supplicant.conf(5) man page as well as the example wpa_supplicant.conf in the documentation directory (e.g. /usr/share/doc/wpa_supplicant-1.0)
WPA2 with wpa_supplicant
Connecting to any wireless access point serving YourSSID
Using bssid to specify which access point it should connect to using its MAC address, in case there are repeaters in place. Remeber to use wpa_passphrase <ssid> [passphrase] to generate the psk
Auto-connect to any unsecured network
By default, wpa_supplicant performs very little debugging without the USE flag debug enabled.
Now, within one terminal issue the command "tail -f /var/log/wpa_supplicant.log" and within another, restart the net.wlan0 device.
Can't Connect to Hidden SSID
This plagued me for several days and I recently found, by an accidental firmware settings reset on my DD-RWT Linksys router, that the settings within DD-WRT can cause havoc for some reason.
So, basically, if you cannot connect to an Access Point (AP) or wireless router using wpa_supplicant, try reseting the AP or wireless router's settings to factory defaults. I know it's a drastic solution, but it solved my issues with trying to connect with a ath9k AR9462 wireless device and WRT54G DD-WRT wireless router [Firmware: DD-WRT v24-sp2 (11/02/09) std]. Some symptoms were, SSID was not broadcasted after setting broadcast to enabled. Setting encryption mode to WPA, didn't allow selecting both WPA Algorithms, and only selected one type. Also, selecting WPA, prevented broadcasting the SSID. Seems to be a firmware glitch and any DD-WRT bug submitter should probably submit this as a possible bug.