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# cat /etc/debian_version 
6.0.4

# uname -r
2.6.32-5-amd64

# lsusb | grep -i Atheros
Bus 002 Device 002: ID 0cf3:7015 Atheros Communications, Inc. TP-Link TL-WN821N v3 802.11n [Atheros AR7010+AR9287]

# lsmod | grep -i ath
ath9k                 249976  0 
mac80211              137372  2 ath9k,ar9170usb
led_class               2433  2 ath9k,ar9170usb
ath                     8006  2 ath9k,ar9170usb
cfg80211              101496  4 ath9k,ar9170usb,mac80211,ath

# tail -n 15 /etc/network/interfaces 
allow-hotplug wlan0
auto wlan0
iface wlan0 inet static
  wpa-driver wext
  wpa-ap-scan 1
  wpa-scan-ssid 1
  wpa-ssid iNet
  wpa-psk 966e459c646e20b96c01d13202b1cfb580fb8bdcca20af961364278aa3929d28
  wpa-key-mgmt WPA-PSK
  address 192.168.1.15
  netmask 255.255.255.0
  network 192.168.1.0
  broadcast 192.168.1.255
  gateway 192.168.1.1
  dns-nameservers 8.8.8.8 208.67.222.222

# iwconfig 
lo        no wireless extensions.

eth0      no wireless extensions.

pan0      no wireless extensions.