bonjour,
voilà ce que ça donne ainsi que la méthode que j'utilise pour me connecter manuellement :
ARKADY:/home/arkadin# ifup wlan0
Internet Software Consortium DHCP Client 2.0pl5
Copyright 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium.
All rights reserved.
Please contribute if you find this software useful.
For info, please visit [
www.isc.org]
sit0: unknown hardware address type 776
sit0: unknown hardware address type 776
Listening on LPF/wlan0/00:c0:49:59:f3:80
Sending on LPF/wlan0/00:c0:49:59:f3:80
Sending on Socket/fallback/fallback-net
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 5
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
No DHCPOFFERS received.
No working leases in persistent database.
Exiting.
Failed to bring up wlan0.
ARKADY:/home/arkadin# iwconfig
lo no wireless extensions.
wlan0 IEEE 802.11g ESSID

ff/any Nickname:"Kot"
Mode:Managed Frequency:2.412 GHz Access Point: 00:00:00:00:00:00
Bit Rate=54 Mb/s Tx-Power:10 dBm Sensitivity=0/3
RTS thr=2347 B Fragment thr=2312 B
Encryption key

ff
Power Management

ff
Link Quality:100 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
eth0 no wireless extensions.
sit0 no wireless extensions.
ARKADY:/home/arkadin# iwconfig wlan0 key [4]
ARKADY:/home/arkadin# iwconfig
lo no wireless extensions.
wlan0 IEEE 802.11g ESSID:"WifiKot1312" Nickname:"Kot"
Mode:Managed Frequency:2.412 GHz Access Point: 00:14:BF:30:BC:45
Bit Rate=54 Mb/s Tx-Power:10 dBm Sensitivity=0/3
RTS thr=2347 B Fragment thr=2312 B
Encryption key

XXXXXXXXXXXXXXXXXXX [4] Security mode:restricted
Power Management

ff
Link Quality:100/100 Signal level:-56 dBm Noise level:-256 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.
ARKADY:/home/arkadin# dhclient wlan0
Internet Software Consortium DHCP Client 2.0pl5
Copyright 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium.
All rights reserved.
Please contribute if you find this software useful.
For info, please visit [
www.isc.org]
sit0: unknown hardware address type 776
sit0: unknown hardware address type 776
Listening on LPF/wlan0/00:c0:49:59:f3:80
Sending on LPF/wlan0/00:c0:49:59:f3:80
Sending on Socket/fallback/fallback-net
DHCPREQUEST on wlan0 to 255.255.255.255 port 67
DHCPNAK from 198.104.85.1
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7
DHCPOFFER from 198.104.85.1
DHCPREQUEST on wlan0 to 255.255.255.255 port 67
DHCPACK from 198.104.85.1
bound to 198.104.85.100 -- renewal in 43200 seconds.
j'espère que ça va aider.
merci,
Arkadin