LinuxQuestions.org - iwlist wlan0 scanning

i used ndiswrapper 1.10
fedora core 2 2.6.5-1.358
SMC2862W

/sbin/iwlist wlan0 scanning
Warning: Driver for device wlan0 recommend version 18 of Wireless Extension,
but has been compiled with version 16, therefore some driver features
may not be available...

wlan0 Scan completed :
Cell 01 - Address: 00:0D:88:9A:0C:4D
ESSID:"xxxxxxxx"
Protocol:IEEE 802.11b
Mode:Managed
Frequency:2.452GHz
Quality:0/100 Signal level:-70 dBm Noise level:-256 dBm
Encryption key:off
Bit Rate:1Mb/s
Bit Rate:2Mb/s
Bit Rate:5.5Mb/s
Bit Rate:11Mb/s
Extra:bcn_int=100
Extra:atim=3

and i try give a command :
/sbin/dhclient

result :
root@localhost root]# /sbin/dhclient
sit0: unknown hardware address type 776
/sbin/dhclient-script: configuration for sit0 not found.
/sbin/dhclient-script: configuration for wlan0 not found.
sit0: unknown hardware address type 776
Listening on LPF/sit0/
Sending on LPF/sit0/
Listening on LPF/lo/
Sending on LPF/lo/
Listening on LPF/wlan0/00:13:f7:19:d7:aa
Sending on LPF/wlan0/00:13:f7:19:d7:aa
Listening on LPF/eth0/00:04:76:4f:59:bc
Sending on LPF/eth0/00:04:76:4f:59:bc
Sending on Socket/fallback
receive_packet failed on sit0: Network is down
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on lo to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on sit0 to 255.255.255.255 port 67 interval 6
send_packet: Network is down
....
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
/sbin/dhclient-script: configuration for wlan0 not found.

thanks,