Item (1):
1.a) Desconectado:
nogueira@nogueira-dell:~$ iwconfig wlan0
wlan0 IEEE 802.11abgn ESSID:"WIFI-SANTACLARA"
Mode:Managed Frequency:2.412 GHz Access Point: 00:21:8D:21:0E:51
Bit Rate=5.5 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=37/70 Signal level=-73 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
nogueira@nogueira-dell:~$
1.b) Conectado:
nogueira@nogueira-dell:~$ iwconfig wlan0
wlan0 IEEE 802.11abgn ESSID:"WIFI-SANTACLARA"
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
nogueira@nogueira-dell:~$
Item (2)
2.a) Desconectado:
nogueira@nogueira-dell:~$ grep wpa_supplicant /var/log/syslog | tail -30
Aug 16 12:08:48 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:08:51 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:09:01 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:09:04 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:09:05 nogueira-dell wpa_supplicant[1410]: Associated with 00:21:8d:21:0e:51
Aug 16 12:09:05 nogueira-dell wpa_supplicant[1410]: WPA: Key negotiation completed with 00:21:8d:21:0e:51 [PTK=TKIP GTK=TKIP]
Aug 16 12:09:05 nogueira-dell wpa_supplicant[1410]: CTRL-EVENT-CONNECTED - Connection to 00:21:8d:21:0e:51 completed (reauth) [id=0 id_str=]
Aug 16 12:09:48 nogueira-dell wpa_supplicant[1410]: CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys
Aug 16 12:09:52 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:10:02 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:10:04 nogueira-dell wpa_supplicant[1410]: Failed to initiate AP scan.
Aug 16 12:10:05 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:10:15 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:10:18 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:10:28 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:10:31 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:10:41 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:10:44 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:10:44 nogueira-dell wpa_supplicant[1410]: Associated with 00:21:8d:21:0e:51
Aug 16 12:10:44 nogueira-dell wpa_supplicant[1410]: WPA: Key negotiation completed with 00:21:8d:21:0e:51 [PTK=TKIP GTK=TKIP]
Aug 16 12:10:44 nogueira-dell wpa_supplicant[1410]: CTRL-EVENT-CONNECTED - Connection to 00:21:8d:21:0e:51 completed (reauth) [id=0 id_str=]
Aug 16 12:11:28 nogueira-dell wpa_supplicant[1410]: CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys
Aug 16 12:11:32 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:11:42 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:11:44 nogueira-dell wpa_supplicant[1410]: Failed to initiate AP scan.
Aug 16 12:11:45 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:11:55 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:11:58 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:12:08 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:12:11 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
nogueira@nogueira-dell:~$
2.b) Conectado:
nogueira@nogueira-dell:~$ grep wpa_supplicant /var/log/syslog | tail -30
Aug 16 12:09:05 nogueira-dell wpa_supplicant[1410]: WPA: Key negotiation completed with 00:21:8d:21:0e:51 [PTK=TKIP GTK=TKIP]
Aug 16 12:09:05 nogueira-dell wpa_supplicant[1410]: CTRL-EVENT-CONNECTED - Connection to 00:21:8d:21:0e:51 completed (reauth) [id=0 id_str=]
Aug 16 12:09:48 nogueira-dell wpa_supplicant[1410]: CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys
Aug 16 12:09:52 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:10:02 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:10:04 nogueira-dell wpa_supplicant[1410]: Failed to initiate AP scan.
Aug 16 12:10:05 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:10:15 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:10:18 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:10:28 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:10:31 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:10:41 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:10:44 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:10:44 nogueira-dell wpa_supplicant[1410]: Associated with 00:21:8d:21:0e:51
Aug 16 12:10:44 nogueira-dell wpa_supplicant[1410]: WPA: Key negotiation completed with 00:21:8d:21:0e:51 [PTK=TKIP GTK=TKIP]
Aug 16 12:10:44 nogueira-dell wpa_supplicant[1410]: CTRL-EVENT-CONNECTED - Connection to 00:21:8d:21:0e:51 completed (reauth) [id=0 id_str=]
Aug 16 12:11:28 nogueira-dell wpa_supplicant[1410]: CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys
Aug 16 12:11:32 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:11:42 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:11:44 nogueira-dell wpa_supplicant[1410]: Failed to initiate AP scan.
Aug 16 12:11:45 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:11:55 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:11:58 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:12:08 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:12:11 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:12:21 nogueira-dell wpa_supplicant[1410]: Authentication with 00:21:8d:21:0e:51 timed out.
Aug 16 12:12:24 nogueira-dell wpa_supplicant[1410]: Trying to associate with 00:21:8d:21:0e:51 (SSID='WIFI-SANTACLARA' freq=2412 MHz)
Aug 16 12:12:24 nogueira-dell wpa_supplicant[1410]: Associated with 00:21:8d:21:0e:51
Aug 16 12:12:24 nogueira-dell wpa_supplicant[1410]: WPA: Key negotiation completed with 00:21:8d:21:0e:51 [PTK=TKIP GTK=TKIP]
Aug 16 12:12:24 nogueira-dell wpa_supplicant[1410]: CTRL-EVENT-CONNECTED - Connection to 00:21:8d:21:0e:51 completed (reauth) [id=0 id_str=]
nogueira@nogueira-dell:~$
Item (3): Bem, a marca do meu roteador eu não sei dizer. Mas não é aquí em casa. É de um vizinho. Fica difícil eu saber. Mas posso te informar também que consigo me conectar de forma estável com o meu Tablet Nokia 810 usando o Sistema Operacional Symbian S60.
Espero que possa ajudar a me ajudar...