mode Ad-Hoc don't work. Look:
[EMAIL PROTECTED]:~$ sudo iwconfig wlan0 mode Ad-Hoc
Error for wireless request "Set Mode" (8B06) :
SET failed on device wlan0 ; Device or resource busy.
[EMAIL PROTECTED]:~$ dmesg | grep iwl
[ 31.810134] iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection
driver for Linux, 1.2.0
[ 31.810145] iwl3945: Copyright(c) 2003-2007 Intel Corporation
[ 31.810395] iwl3945: Detected Intel PRO/Wireless 3945ABG Network Connection
[ 34.324422] iwl3945: Tunable channels: 13 802.11bg, 23 802.11a channels
[ 34.325176] wmaster0: Selected rate control algorithm 'iwl-3945-rs'
[ 332.616724] iwl3945: Radio Frequency Kill Switch is On:
[ 5186.555600] iwl3945: Radio Frequency Kill Switch is On:
[EMAIL PROTECTED]:~$ dmesg | grep network
[ 332.616731] Kill switch must be turned off for wireless networking to work.
[ 5186.555609] Kill switch must be turned off for wireless networking to work.
[EMAIL PROTECTED]:~$ dmesg | grep wlan0
[ 47.116750] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 211.010586] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 4624.124172] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 4625.198096] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 5195.754008] ADDRCONF(NETDEV_UP): wlan0: link is not ready
--
[hardy][iwl3945] 3945ABG cannot associate to public WPA2 PSK network
https://bugs.launchpad.net/bugs/203793
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