wpa_supplicant

Wi-Fi Protected Access client and IEEE 802.1X supplicant

Test wpa_supplicant, assuming ath0 as interface and madwifi as the driver, try wpa_supplicant -h to see other possible drivers
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sudo wpa_supplicant -iath0 -c/etc/wpa_supplicant.conf -Dmadwifi -wTest wpa_supplicant, assuming ath0 as interface and madwifi as the driver, try wpa_supplicant -h to see other possible drivers

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Result:

 Trying to associate with 00:af:00:2a:a7:2d (SSID='NetworkEssid' freq=0 MHz)
  Associated with 00:af:00:2a:a7:2d
  WPA: Key negotiation completed with 00:af:00:2a:a7:2d [PTK=TKIP GTK=TKIP]