jonathan@jonathan-KDEiMacIntel:~$ dhclient
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/

can't create /var/lib/dhcp3/dhclient.leases: Permission denied
Can't create /var/run/dhclient.pid: Permission denied
drop_privileges: could not set group id: Operation not permitted
jonathan@jonathan-KDEiMacIntel:~$ sudo dhclient
Password:
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/eth0/00:16:cb:9d:33:6f
Sending on   LPF/eth0/00:16:cb:9d:33:6f
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 9
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
jonathan@jonathan-KDEiMacIntel:~$ iwconfig sudo iwlist eth0 scan
Error : unrecognised wireless request "iwlist"
jonathan@jonathan-KDEiMacIntel:~$ sudo iwlist eth0 scan
eth0      Interface doesn't support scanning.

jonathan@jonathan-KDEiMacIntel:~$ sudo iwconfig eth0 essid "Inalambrico de casa" sudo iwconfig eth0 key 00XX00XX10 open sudo dhclient eth0
Error for wireless request "Set ESSID" (8B1A) :
    SET failed on device eth0 ; Operation not supported.
jonathan@jonathan-KDEiMacIntel:~$ sudo iwconfig eth0 key 00XX00XX10 restricted sudo dhclient eth0
Error for wireless request "Set Encode" (8B2A) :
    SET failed on device eth0 ; Operation not supported.
jonathan@jonathan-KDEiMacIntel:~$