hp nc6000的w500无线网卡驱动问题

[ty3247]

大家好，我是一个ubuntu的新手，昨天费了半天得劲将中文输入搞定，但是今天想驱动无线的网卡，该网卡在系统中已经被识别了，由于我的AP是linksys的wrt54g，是加了密的，我的web密码是对的，目前的问题是不能获的ip,但在windows中是正常的，我用命令看到如下的信息：
ifconfig ath0
ath0 Link encap:Ethernet HWaddr 00:0F:20:95:67:9E
inet6 addr: fe80::20f:20ff:fe95:679e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:38 errors:339 dropped:0 overruns:0 frame:339
TX packets:103 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:200
RX bytes:6804 (6.6 KiB) TX bytes:33370 (32.5 KiB)
Interrupt:11 Memory:f8b20000-f8b30000

iwconfig
lo no wireless extensions.

ath0 IEEE 802.11g ESSID:"linksys"
Mode:Managed Frequency:2.437 GHz Access Point: 00:0C:41:9D:3D:2D
Bit Rate:36 Mb/s Tx-Power:18 dBm Sensitivity=0/3
Retry:off RTS thr:off Fragment thr:off
Power Management:off
Link Quality=49/94 Signal level=-46 dBm Noise level=-95 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

eth0 no wireless extensions.

sit0 no wireless extensions.

sudo dhclient ath0
Internet Systems Consortium DHCP Client V3.0.3
Copyright 2004-2005 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/products/DHCP

Listening on LPF/ath0/00:0f:20:95:67:9e
Sending on LPF/ath0/00:0f:20:95:67:9e
Sending on Socket/fallback
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 21
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 1
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
请各位大虾帮我看看，问题大概在哪，小弟在线等啊，谢谢了！