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Placa D-Link DWL-G520 (Atheros AR5212/5213) no Debian Lenny

Oi Pessoal,

Não estou conseguindo configurar minha placa de rede sem fio no Debian
Lenny. Ela é uma DWL-G520 (Atheros AR5212/5213).
O roteador é um Linksys WRT54G e está configurado com WPA Personal / TKIP.

Segui as instruções do site http://wiki.debian.org/WPA e configurei
meu /etc/network/interfaces como abaixo:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

iface wlan0 inet dhcp
	wpa-ssid HomeNet
	wpa-psk xxxxxxxxx

auto wlan0

Depois dei um ifup wlan0 e ele mostra a seguinte mensagem:

debian:~# ifup wlan0
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

wmaster0: unknown hardware address type 801
wmaster0: unknown hardware address type 801
Listening on LPF/wlan0/00:1b:11:12:5a:e4
Sending on   LPF/wlan0/00:1b:11:12:5a:e4
Sending on   Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

O que falta eu fazer?

Eu vi que ele usa o ath5k. Eu preciso do madwifi instalado mesmo assim?

Instalei o wireless-tools e dando o iwconfig ele mostra o seguinte:

iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wmaster0  no wireless extensions.

wlan0     IEEE 802.11  ESSID:"HomeNet"
          Mode:Managed  Frequency:2.422 GHz  Access Point: Not-Associated
          Tx-Power=20 dBm
          Retry min limit:7   RTS thr:off   Fragment thr=2352 B
          Encryption key:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0


Obrigado,
Paulo
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