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Fotomaton

Wifi qui ralentit et pertes de connexions

Bonjour tout le monde!
Voilà, j'ai un léger problème auquel je ne comprend pas grand chose. J'ai installé Ubuntu sur un PC qui a maintenant pas mal d'années pour le faire revivre et ça marche plutôt bien, seulement ce dernier n'a pas de carte wifi. J'ai donc essayé une clé wifi que j'utilise sur un autre PC, la Belkin N300, qui n'a pas marché (pas trop de surprise) mais d'une façon un peu particulière : elle détecte les réseaux et tente de s'y connecter, en boucle (toutes les 30 secondes environ) sans jamais réussir.
j'ai donc trouvé dans la liste des cartes et clés testées la Hercules HWGUm-54 et je l'ai commandée : miracle, tout fonctionne! Seulement voilà :
- très souvent le débit baisse progressivement, parfois jusqu'au néant (je n'ai pas de chiffres mais je l'ai senti, par exemple une fois je peux regarder du full hd pendant 15 secondes d'affilée, une autre fois c'est juste inconcevable)
- parfois la clé ne parvient pas à se connecter et boucle comme la N300 de Belkin; je dois la débrancher et la rebrancher pour que ça marche
- J'ai de temps en temps une perte de connexion mais pas trop souvent

Je n'y comprend vraiment rien et j'aimerais bien y voir plus clair...
Au cas où j'ai réalisé cette manœuvre, mais je ne sais pas si elle a servi à quelque chose :
     - gksudo gedit /etc/modprobe.d/iwlwifi.conf
    - ligne rajoutée à la fin : "options iwlwifi 11n_disable=1"

Voici les commandes demandées (si ça peut être utile, je suis sous 12.04.2 et ma box c'est "Livebox-bb36"):

cat /etc/lsb-release

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.2 LTS"

lsusb

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 005: ID 06f8:e032 Guillemot Corp. HWGUm-54 [Hercules Wireless G Ultra Mini Key]
Bus 002 Device 002: ID 0644:0200 TEAC Corp. All-In-One Multi-Card Reader CA200/B/S
Bus 004 Device 002: ID 413c:3012 Dell Computer Corp. Optical Wheel Mouse
Bus 004 Device 003: ID 413c:2003 Dell Computer Corp. Keyboard

lspci

00:00.0 Host bridge: Intel Corporation 82G33/G31/P35/P31 Express DRAM Controller (rev 02)
00:01.0 PCI bridge: Intel Corporation 82G33/G31/P35/P31 Express PCI Express Root Port (rev 02)
00:19.0 Ethernet controller: Intel Corporation 82562V-2 10/100 Network Connection (rev 02)
00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 02)
00:1a.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 02)
00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 02)
00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92)
00:1f.0 ISA bridge: Intel Corporation 82801IR (ICH9R) LPC Interface Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 4 port SATA Controller [IDE mode] (rev 02)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 02)
00:1f.5 IDE interface: Intel Corporation 82801I (ICH9 Family) 2 port SATA Controller [IDE mode] (rev 02)
01:00.0 VGA compatible controller: NVIDIA Corporation G86 [GeForce 8300 GS] (rev a1)
02:01.0 FireWire (IEEE 1394): LSI Corporation FW322/323 (rev 61)

lspci -nn | grep -i net

00:19.0 Ethernet controller [0200]: Intel Corporation 82562V-2 10/100 Network Connection [8086:10c0] (rev 02)

lspci -k

00:00.0 Host bridge: Intel Corporation 82G33/G31/P35/P31 Express DRAM Controller (rev 02)
	Subsystem: Dell Device 0238
00:01.0 PCI bridge: Intel Corporation 82G33/G31/P35/P31 Express PCI Express Root Port (rev 02)
	Kernel driver in use: pcieport
	Kernel modules: shpchp
00:19.0 Ethernet controller: Intel Corporation 82562V-2 10/100 Network Connection (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: e1000e
	Kernel modules: e1000e
00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: uhci_hcd
00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: uhci_hcd
00:1a.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: uhci_hcd
00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: ehci_hcd
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd-hda-intel
00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: uhci_hcd
00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: uhci_hcd
00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: uhci_hcd
00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: ehci_hcd
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92)
00:1f.0 ISA bridge: Intel Corporation 82801IR (ICH9R) LPC Interface Controller (rev 02)
	Subsystem: Dell Device 0238
	Kernel modules: iTCO_wdt
00:1f.2 IDE interface: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 4 port SATA Controller [IDE mode] (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: ata_piix
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 02)
	Subsystem: Dell Device 0238
	Kernel modules: i2c-i801
00:1f.5 IDE interface: Intel Corporation 82801I (ICH9 Family) 2 port SATA Controller [IDE mode] (rev 02)
	Subsystem: Dell Device 0238
	Kernel driver in use: ata_piix
01:00.0 VGA compatible controller: NVIDIA Corporation G86 [GeForce 8300 GS] (rev a1)
	Subsystem: NVIDIA Corporation Device 0494
	Kernel driver in use: nouveau
	Kernel modules: nouveau, nvidiafb
02:01.0 FireWire (IEEE 1394): LSI Corporation FW322/323 (rev 61)
	Subsystem: Dell Device 8010
	Kernel driver in use: firewire_ohci
	Kernel modules: firewire-ohci

sudo lshw -C network

  *-network               
       description: Ethernet interface
       produit: 82562V-2 10/100 Network Connection
       fabriquant: Intel Corporation
       identifiant matériel: 19
       information bus: pci@0000:00:19.0
       nom logique: eth0
       version: 02
       numéro de série: 00:1a:a0:9a:d2:da
       capacité: 100Mbit/s
       bits: 32 bits
       horloge: 33MHz
       fonctionnalités: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=1.5.1-k firmware=1.1-2 latency=0 link=no multicast=yes port=twisted pair
       ressources: irq:41 mémoire:fdfc0000-fdfdffff mémoire:fdfff000-fdffffff portE/S:ff00(taille=32)
  *-network
       description: Interface réseau sans fil
       identifiant matériel: 1
       information bus: usb@1:6
       nom logique: wlan0
       numéro de série: 00:08:d3:93:6b:f8
       fonctionnalités: ethernet physical wireless
       configuration: broadcast=yes driver=r8712u ip=192.168.1.23 multicast=yes wireless=IEEE 802.11bg

lsmod

Module                  Size  Used by
parport_pc             32866  0 
ppdev                  17113  0 
rfcomm                 47604  0 
bnep                   18281  2 
bluetooth             180153  10 rfcomm,bnep
snd_hda_codec_realtek   224173  1 
snd_hda_intel          33719  3 
snd_hda_codec         127706  2 snd_hda_codec_realtek,snd_hda_intel
snd_hwdep              17764  1 snd_hda_codec
snd_pcm                97275  2 snd_hda_intel,snd_hda_codec
snd_seq_midi           13324  0 
dcdbas                 14490  0 
snd_rawmidi            30748  1 snd_seq_midi
psmouse                97485  0 
snd_seq_midi_event     14899  1 snd_seq_midi
snd_seq                61929  2 snd_seq_midi,snd_seq_midi_event
r8712u                189646  0 
snd_timer              29990  2 snd_pcm,snd_seq
snd_seq_device         14540  3 snd_seq_midi,snd_rawmidi,snd_seq
serio_raw              13211  0 
snd                    79041  15 snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore              15091  1 snd
snd_page_alloc         18529  2 snd_hda_intel,snd_pcm
mac_hid                13253  0 
nouveau               775039  3 
ttm                    76949  1 nouveau
drm_kms_helper         46978  1 nouveau
drm                   241971  5 nouveau,ttm,drm_kms_helper
i2c_algo_bit           13423  1 nouveau
mxm_wmi                13021  1 nouveau
wmi                    19256  1 mxm_wmi
video                  19651  1 nouveau
lp                     17799  0 
parport                46562  3 parport_pc,ppdev,lp
usbhid                 47238  0 
hid                    99636  1 usbhid
firewire_ohci          41000  0 
firewire_core          63600  1 firewire_ohci
crc_itu_t              12707  1 firewire_core
e1000e                156873  0 
usb_storage            49243  0 

iwconfig

lo        no wireless extensions.

wlan0     IEEE 802.11bg  ESSID:"Livebox-bb36"  Nickname:"rtl_wifi"
          Mode:Managed  Frequency:2.457 GHz  Access Point: 00:1A:6B:CA:04:98   
          Bit Rate:54 Mb/s   Sensitivity:0/0  
          Retry:off   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=93/100  Signal level=44/100  Noise level=0/100
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

eth0      no wireless extensions.

ifconfig

eth0      Link encap:Ethernet  HWaddr 00:1a:a0:9a:d2:da  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000 
          Octets reçus:0 (0.0 B) Octets transmis:0 (0.0 B)
          Interruption:20 Mémoire:fdfc0000-fdfe0000 

lo        Link encap:Boucle locale  
          inet adr:127.0.0.1  Masque:255.0.0.0
          adr inet6: ::1/128 Scope:Hôte
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          Packets reçus:993 erreurs:0 :0 overruns:0 frame:0
          TX packets:993 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0 
          Octets reçus:75990 (75.9 KB) Octets transmis:75990 (75.9 KB)

wlan0     Link encap:Ethernet  HWaddr 00:08:d3:93:6b:f8  
          inet adr:192.168.1.23  Bcast:192.168.1.255  Masque:255.255.255.0
          adr inet6: fe80::208:d3ff:fe93:6bf8/64 Scope:Lien
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:6305 erreurs:0 :120 overruns:0 frame:0
          TX packets:4183 errors:0 dropped:26 overruns:0 carrier:0
          collisions:0 lg file transmission:1000 
          Octets reçus:6741787 (6.7 MB) Octets transmis:582456 (582.4 KB)

sudo iwlist scan

lo        Interface doesn't support scanning.

wlan0     Scan completed :
          Cell 01 - Address: 00:1A:6B:CA:04:98
                    ESSID:"Livebox-bb36"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Frequency:2.457 GHz (Channel 10)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Extra:wpa_ie=dd180050f20101000050f20201000050f20201000050f2020c00
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (1) : TKIP
                        Authentication Suites (1) : PSK
                    Signal level=100/100  
          Cell 02 - Address: 00:1A:2B:8C:49:97
                    ESSID:"NUMERICABLE-5837"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.412 GHz (Channel 1)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Extra:wpa_ie=dd1c0050f20101000050f20202000050f2040050f20201000050f2020c00
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    Extra:rsn_ie=30180100000fac020200000fac04000fac020100000fac020c00
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD180050F204104A00011010440001021049000600372A000120
                    Signal level=43/100  
          Cell 03 - Address: 00:19:70:51:05:F6
                    ESSID:"Livebox-1ce0"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.437 GHz (Channel 6)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:wpa_ie=dd1a0050f20101000050f20202000050f2040050f20201000050f202
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    Extra:rsn_ie=30180100000fac020200000fac04000fac020100000fac020000
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD880050F204104A000110104400010210570001001041000100103B00010310470010E8BE81231CE0E8BE81231CE081231CE010210005536167656D102300084C697665626F7832102400084C697665626F78321042000A4C4B31303236344450351054000800060050F20400011011000D4C697665626F78322D31434530100800020086103C000101
                    Signal level=26/100  
          Cell 04 - Address: 00:1A:2B:6A:CE:AA
                    ESSID:"NUMERICABLE-7A5D"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Frequency:2.437 GHz (Channel 6)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Signal level=43/100  
          Cell 05 - Address: 5C:33:8E:9D:75:D1
                    ESSID:"Livebox-b6f6"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.437 GHz (Channel 6)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:wpa_ie=dd1a0050f20101000050f20202000050f2040050f20201000050f202
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    Extra:rsn_ie=30180100000fac020200000fac04000fac020100000fac020000
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD880050F204104A000110104400010210570001001041000100103B00010310470010405A9B35B6F6405A9B35B6F69B35B6F610210005536167656D102300084C697665626F7832102400084C697665626F78321042000A414E31323232373235341054000800060050F20400011011000D4C697665626F78322D42364636100800020086103C000101
                    Signal level=42/100  
          Cell 06 - Address: F4:CA:E5:DD:9B:C6
                    ESSID:"FreeWifi_secure"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.442 GHz (Channel 7)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:rsn_ie=30180100000fac020200000fac04000fac020100000fac010c00
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : 802.1x
                    Signal level=43/100  
          Cell 07 - Address: 00:19:70:82:36:08
                    ESSID:"Livebox-bba9"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.437 GHz (Channel 6)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:wpa_ie=dd1a0050f20101000050f20202000050f2040050f20201000050f202
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    Extra:rsn_ie=30180100000fac020200000fac04000fac020100000fac020000
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD880050F204104A000110104400010210570001001041000100103B0001031047001090013BDBBBA990013BDBBBA93BDBBBA910210005536167656D102300084C697665626F7832102400084C697665626F78321042000A4C4B31313232344450321054000800060050F20400011011000D4C697665626F78322D42424139100800020086103C000101
                    Signal level=42/100  
          Cell 08 - Address: F4:CA:E5:F8:36:10
                    ESSID:"fifi"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.442 GHz (Channel 7)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Signal level=10/100  
          Cell 09 - Address: 00:1C:A2:D7:F6:44
                    ESSID:"ALICE-LAN-8EDFC9"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Extra:wpa_ie=dd1c0050f20101000050f20202000050f2040050f20201000050f2020000
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    Signal level=26/100  
          Cell 10 - Address: F4:CA:E5:DD:9B:C5
                    ESSID:"FreeWifi"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.442 GHz (Channel 7)
                    Encryption key:off
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Signal level=42/100  
          Cell 11 - Address: 00:24:D4:51:E5:16
                    ESSID:"FreeWifi_secure"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:rsn_ie=30180100000fac020200000fac04000fac020100000fac010c00
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : 802.1x
                    Signal level=42/100  
          Cell 12 - Address: 00:25:15:B3:7E:28
                    ESSID:"NEUF_7E24"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Extra:wpa_ie=dd1c0050f20101000050f20202000050f2040050f20201000050f2020c00
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD840050F204104A00011010440001021041000100103B00010310470010D96C7EFC2F8938F1EFBD6E5148BFA812102100044E4555461023000A4E42342D5345522D72321024000A4E42342D5345522D72321042000C3030323531354233374532341054000800060050F2040001101100094E4555465F37453234100800020084103C000101
                    Signal level=26/100  
          Cell 13 - Address: B2:25:15:B3:7E:29
                    ESSID:"SFR WiFi Public"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:off
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Signal level=26/100  
          Cell 14 - Address: 84:74:2A:4F:F4:22
                    ESSID:"Livebox-F422"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:wpa_ie=dd1a0050f20101000050f20202000050f2040050f20201000050f202
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    Extra:rsn_ie=30180100000fac020200000fac04000fac020100000fac020000
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD920050F204104A0001101044000102103B000103104700100000000000001000000084742A4FF422102100035A54451023000F4C697665626F7820465454482076321024001A6164363833365F4144534C5F5048595F30783030303030303030104200074C4D5A313230341054000800060050F20400011011000D465446525341332E363735373110080002008A103C000101
                    Signal level=42/100  
          Cell 15 - Address: 00:25:15:B2:8C:78
                    ESSID:"NEUF_8C74"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Extra:wpa_ie=dd1c0050f20101000050f20202000050f2040050f20201000050f2020c00
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD0E0050F204104A0001101044000102
                    Signal level=42/100  
          Cell 16 - Address: 00:24:D4:51:E5:14
                    ESSID:"freebox_ZAJFXL"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:wpa_ie=dd1a0050f20101000050f20202000050f2040050f20201000050f202
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    Signal level=43/100  
          Cell 17 - Address: BA:54:7A:88:DB:A1
                    ESSID:"<hidden>"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.467 GHz (Channel 12)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
                              18 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 12 Mb/s
                              24 Mb/s; 48 Mb/s
                    Extra:rsn_ie=30140100000fac040100000fac040100000fac020000
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
                    Signal level=42/100  
          Cell 18 - Address: BA:54:7A:88:DB:A3
                    ESSID:"FreeWifi_secure"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.467 GHz (Channel 12)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
                              18 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 12 Mb/s
                              24 Mb/s; 48 Mb/s
                    Extra:wpa_ie=dd160050f20101000050f20401000050f20401000050f201
                    IE: WPA Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : 802.1x
                    Signal level=42/100  
          Cell 19 - Address: 00:24:D4:51:E5:15
                    ESSID:"FreeWifi"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:off
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Signal level=43/100  

eth0      Interface doesn't support scanning.

uname -r -m

3.2.0-40-generic x86_64

cat  /etc/network/interfaces

auto lo
iface lo inet loopback

nm-tool

NetworkManager Tool

State: connected (global)

- Device: wlan0  [Livebox-bb36] ------------------------------------------------
  Type:              802.11 WiFi
  Driver:            r8712u
  State:             connected
  Default:           yes
  HW Address:        00:08:D3:93:6B:F8

  Capabilities:
    Speed:           54 Mb/s

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points (* = current AP)
    FreeWifi_secure: Infra, 00:24:D4:51:E5:16, Freq 2462 MHz, Rate 54 Mb/s, Strength 42 WPA2 Enterprise
    ALICE-LAN-8EDFC9:Infra, 00:1C:A2:D7:F6:44, Freq 2462 MHz, Rate 54 Mb/s, Strength 42 WPA
    NUMERICABLE-7A5D:Infra, 00:1A:2B:6A:CE:AA, Freq 2437 MHz, Rate 54 Mb/s, Strength 42 WEP
    rovena:          Infra, BA:54:7A:88:DB:A0, Freq 2467 MHz, Rate 54 Mb/s, Strength 42 WEP
    Livebox-F422:    Infra, 84:74:2A:4F:F4:22, Freq 2462 MHz, Rate 54 Mb/s, Strength 42 WPA WPA2
    *Livebox-bb36:   Infra, 00:1A:6B:CA:04:98, Freq 2457 MHz, Rate 54 Mb/s, Strength 90 WPA
    NUMERICABLE-5837:Infra, 00:1A:2B:8C:49:97, Freq 2412 MHz, Rate 54 Mb/s, Strength 44 WPA WPA2
    TGL:             Infra, F4:CA:E5:DD:9B:C4, Freq 2442 MHz, Rate 54 Mb/s, Strength 42 WPA
    Livebox-bba9:    Infra, 00:19:70:82:36:08, Freq 2437 MHz, Rate 54 Mb/s, Strength 42 WPA WPA2
    SFR WiFi Public: Infra, B2:25:15:B3:7E:29, Freq 2462 MHz, Rate 54 Mb/s, Strength 26
    FreeWifi_secure: Infra, BA:54:7A:88:DB:A3, Freq 2467 MHz, Rate 54 Mb/s, Strength 42 WPA Enterprise
    FreeWifi_secure: Infra, F4:CA:E5:F8:36:12, Freq 2442 MHz, Rate 54 Mb/s, Strength 26 WPA2 Enterprise
    fifi:            Infra, F4:CA:E5:F8:36:10, Freq 2442 MHz, Rate 54 Mb/s, Strength 26 WEP
    FreeWifi:        Infra, 00:24:D4:51:E5:15, Freq 2462 MHz, Rate 54 Mb/s, Strength 26
    NEUF_8C74:       Infra, 00:25:15:B2:8C:78, Freq 2462 MHz, Rate 54 Mb/s, Strength 42 WPA
    Livebox-1ce0:    Infra, 00:19:70:51:05:F6, Freq 2437 MHz, Rate 54 Mb/s, Strength 26 WPA WPA2
    SFR WiFi Mobile: Infra, B2:25:15:B3:7E:2B, Freq 2462 MHz, Rate 54 Mb/s, Strength 10 WPA2 Enterprise
    NUMERICABLE-AAA0:Infra, 00:1A:2B:58:16:13, Freq 2462 MHz, Rate 54 Mb/s, Strength 7 WEP
    orange:          Infra, 06:19:70:51:05:F6, Freq 2437 MHz, Rate 54 Mb/s, Strength 42
    Bouygues Telecom Wi-Fi: Infra, 02:1F:9F:BB:59:06, Freq 2412 MHz, Rate 54 Mb/s, Strength 26
    FreeWifi:        Infra, BA:54:7A:88:DB:A2, Freq 2467 MHz, Rate 54 Mb/s, Strength 26

  IPv4 Settings:
    Address:         192.168.1.23
    Prefix:          24 (255.255.255.0)
    Gateway:         192.168.1.1

    DNS:             192.168.1.1


- Device: eth0 -----------------------------------------------------------------
  Type:              Wired
  Driver:            e1000e
  State:             unavailable
  Default:           no
  HW Address:        00:1A:A0:9A:D2:DA

  Capabilities:
    Carrier Detect:  yes

  Wired Properties
    Carrier:         off

Merci d'avance de votre aide!

Dernière modification par Fotomaton (Le 16/04/2013, à 12:16)

nam1962

Re : Wifi qui ralentit et pertes de connexions

J'ai commis une chcklist au #4 là, à voir avant de tweeker http://forum.ubuntu-fr.org/viewtopic.ph … #p12838931

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Fotomaton

Re : Wifi qui ralentit et pertes de connexions

J'ai oublié de préciser que j'exploite ma box sur un autre PC sur lequel je n'ai jamais eu de problème, avec un débit très élevé. Après, l'ordinateur qui  le problème est plus éloigné, mais j'ai aussi un portable qui fonctionne normalement au même endroit...
je vais quand même regarder ça !
Après il faudrait peut être que je nettoie l'intérieur de la tour? Ou ça n'a rien à voir?

EDIT : je précise que

sudo rfkill list

ne me retourne rien, je suis formel !

Dernière modification par Fotomaton (Le 16/04/2013, à 12:50)

Fotomaton

Re : Wifi qui ralentit et pertes de connexions

Donc, personne d'autre n'aurait une idée?

Fotomaton

Re : Wifi qui ralentit et pertes de connexions

Je me permet de remonter mon topic, ma connexion semble toujours ausis mal en point, mais en plus maintenant elle se coupe très régulièrement, je ne sais plus quoi faire! Dois-je reposter les résultats des commandes?
Merci d'avance

nam1962

Re : Wifi qui ralentit et pertes de connexions

A propos, as tu nettoyé ta tour?

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