Thanks for your patience, Handsome-geek.
I previously read that my card model does support injection in a thread of this very forum which linked to an aircrack-ng forum (I am sorry, I am not allowed to post the URL since I am a newbie member).
After reading the post, I decided to install the Ubuntu 9.04 32 bits on my laptop.
I've installed aircrack-ng on my new Ubuntu distribution and I've tested it against a free encryption net, that is, the public net I use in my home but configured without protection.
This time, this has been the result:
Ok, this time it seems I manage to associate successfully but it won't sent packets.
sudo aireplay-ng -1 0 -a [BSSID] -h [MAC_INTERFACE] -e [ESSID] mon0
03:38:23 Waiting for beacon frame (BSSID: [BSSID]) on channel 13
03:38:23 Sending Authentication Request (Open System)
03:38:25 Sending Authentication Request (Open System)
03:38:27 Sending Authentication Request (Open System)
03:38:29 Sending Authentication Request (Open System) [ACK]
03:38:29 Authentication successful
03:38:29 Sending Association Request
03:38:34 Sending Authentication Request (Open System)
03:39:04 Sending Authentication Request (Open System) [ACK]
03:39:04 Authentication successful
03:39:04 Sending Association Request [ACK]
03:39:04 Association successful :-) (AID: 1)
kraken@kraken-laptop:~$ sudo aireplay-ng -3 -b [BSSID] -h [MAC_INTERFACE] mon0
03:41:11 Waiting for beacon frame (BSSID: [BSSID]) on channel 13
Saving ARP requests in replay_arp-0513-034111.cap
You should also start airodump-ng to capture replies.
Read 20611 packets (got 0 ARP requests and 35 ACKs), sent 0 packets...(0 pps)
Moreover, after performing injection test with aireplay, I get apparently good results:
So, regarding these results and all the information found in previous entries in this forum and in aircrack-ng forum, my card does support injection.
kraken@kraken-laptop:~$ sudo aireplay-ng -9 mon0
04:03:56 Trying broadcast probe requests...
04:03:56 Injection is working!
04:03:58 Found 2 APs
04:03:58 Trying directed probe requests...
04:03:58 [BSSID] - channel: 11 - 'NET01'
04:04:03 Ping (min/avg/max): 0.038ms/47.253ms/118.576ms Power: -80.83
04:04:03 6/30: 20%
04:04:03 [BSSID] - channel: 13 - 'NET02'
04:04:05 Ping (min/avg/max): 6.660ms/57.116ms/71.297ms Power: -82.29
04:04:05 28/30: 93%
It seems we have taken an step further now, because I have managed to associate to the AP. But the problem of packet sending persists. Any ideas?
By the way, thanks a lot for your help.