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Probleme wifi ubuntu

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Salut!

Je suis sous ubuntu feisty!

J'ai un probleme pour configurer le wifi: impossible de me connecter via mon dongle olitec installé sans soucis avec ndiswrapper!

Voici mon fichier /etc/network/interfaces:

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface

auto eth1 
iface eth1 inet dhcp

# The secondary network interface

auto wlan0
iface wlan0 inet dhcp
#address 192.168.2.11
#netmask 255.255.255.0
#network 192.168.2.0
#broadcast 192.168.2.255
gateway 192.168.2.1
wireless-mode Managed
wireless-essid PAUPIETTE
wireless-channel 11
#wireless-key **********
wireless-rate auto

J'ai commenté le cryptage WEP car je fais des essais sans aucunes protections!

Je scan bien tous les reseaux avec iwscan list!

Le resultat de iwconfig:

wlan0	 IEEE 802.11g  ESSID:off/any  
	  Mode:Managed  Frequency:2.462 GHz  Access Point: Not-Associated   
	  Bit Rate=1 Mb/s   Sensitivity=-200 dBm  
	  RTS thr=2347 B   Fragment thr=2346 B   
	  Encryption key:848F-7EF0-8C   Security mode:restricted
	  Power Management: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

En fait le dhcp ne veux pas me donner d'adresse ip!

Voici l'erreur que j'ai lorsque je fais ifup wlan0:

There is already a pid file /var/run/dhclient.wlan0.pid with pid 134993416
Internet Systems Consortium DHCP Client V3.0.4
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/wlan0/00:0a:78:8c:eb:85
Sending on   LPF/wlan0/00:0a:78:8c:eb:85
Sending on   Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 5
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 14
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 2
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

Et en ip statique ça ne fonctionne pas non plus! Idem avec network-manager!

D'ou pourrait venir le problème d'apres vous??

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