wep su wireless

[Luca Delucchi]

Ciao a tutti un mio amico ha una password wep sul suo wireless,mi
spiegate come farlo funzionare? Ho delle difficoltà pure via linea di
comando

luca@portatile:~$ sudo dhclient wlan0
There is already a pid file /var/run/dhclient.pid with pid 6059
killed old client process, removed PID file
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/wlan0/00:0e:9b:4f:28:3b
Sending on   LPF/wlan0/00:0e:9b:4f:28:3b
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 8
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

luca@portatile:~$ sudo iwconfig wlan0 mode Managed  channel 10 essid RT2561_5
luca@portatile:~$ iwconfig wlan0
wlan0     IEEE 802.11g  ESSID:off/any
          Mode:Managed  Frequency:2.457 GHz  Access Point: Not-Associated
          Bit Rate=1 Mb/s
          RTS thr=2347 B   Fragment thr=2346 B
          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

grazie a tutti
Luca