For a few days now, my wifi is getting disrupted every few minutes. I use a 'vanilla' Ubuntu installation (i.e Unity, NetworkManager etc.). After an hour or so, the connection gets severed completely and NetworkManager can't find the network anymore. Toggling "Enable Wi-Fi" in the NetworkManager-menu allows me to find and connect to the network again.
This is an excerpt from /var/log/syslog:
May 14 16:50:51 terminus kernel: [ 4208.006043] wlan0: deauthenticated from 00:24:fe:a3:98:f6 (Reason: 6)
May 14 16:50:51 terminus wpa_supplicant[907]: wlan0: CTRL-EVENT-DISCONNECTED bssid=00:24:fe:a3:98:f6 reason=6
May 14 16:50:51 terminus NetworkManager[868]: <warn> Connection disconnected (reason 6)
May 14 16:50:51 terminus wpa_supplicant[907]: wlan0: SME: Trying to authenticate with 00:24:fe:a3:98:f6 (SSID='FRITZ!Box Fon WLAN 7270' freq=2447 MHz)
May 14 16:50:51 terminus kernel: [ 4208.034507] cfg80211: Calling CRDA to update world regulatory domain
May 14 16:50:51 terminus kernel: [ 4208.035050] wlan0: authenticate with 00:24:fe:a3:98:f6
May 14 16:50:51 terminus kernel: [ 4208.042178] wlan0: send auth to 00:24:fe:a3:98:f6 (try 1/3)
May 14 16:50:51 terminus NetworkManager[868]: <info> (wlan0): supplicant interface state: completed -> authenticating
May 14 16:50:51 terminus wpa_supplicant[907]: wlan0: Trying to associate with 00:24:fe:a3:98:f6 (SSID='FRITZ!Box Fon WLAN 7270' freq=2447 MHz)
May 14 16:50:51 terminus kernel: [ 4208.042526] cfg80211: World regulatory domain updated:
May 14 16:50:51 terminus kernel: [ 4208.042533] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
May 14 16:50:51 terminus kernel: [ 4208.042539] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 14 16:50:51 terminus kernel: [ 4208.042543] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 14 16:50:51 terminus kernel: [ 4208.042547] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
May 14 16:50:51 terminus kernel: [ 4208.042550] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 14 16:50:51 terminus kernel: [ 4208.042554] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 14 16:50:51 terminus kernel: [ 4208.044622] wlan0: authenticated
May 14 16:50:51 terminus kernel: [ 4208.046291] wlan0: associate with 00:24:fe:a3:98:f6 (try 1/3)
May 14 16:50:51 terminus NetworkManager[868]: <info> (wlan0): supplicant interface state: authenticating -> associating
May 14 16:50:51 terminus kernel: [ 4208.056055] wlan0: RX AssocResp from 00:24:fe:a3:98:f6 (capab=0x431 status=0 aid=1)
May 14 16:50:51 terminus wpa_supplicant[907]: wlan0: Associated with 00:24:fe:a3:98:f6
May 14 16:50:51 terminus kernel: [ 4208.065893] wlan0: associated
May 14 16:50:51 terminus NetworkManager[868]: <info> (wlan0): supplicant interface state: associating -> 4-way handshake
May 14 16:50:51 terminus wpa_supplicant[907]: wlan0: WPA: Key negotiation completed with 00:24:fe:a3:98:f6 [PTK=CCMP GTK=TKIP]
May 14 16:50:51 terminus wpa_supplicant[907]: wlan0: CTRL-EVENT-CONNECTED - Connection to 00:24:fe:a3:98:f6 completed [id=0 id_str=]
May 14 16:50:51 terminus NetworkManager[868]: <info> (wlan0): supplicant interface state: 4-way handshake -> completed
May 14 16:51:55 terminus wpa_supplicant[907]: wlan0: CTRL-EVENT-SCAN-STARTED
May 14 16:52:27 terminus kernel: [ 4304.188238] wlan0: deauthenticated from 00:24:fe:a3:98:f6 (Reason: 6)
May 14 16:52:27 terminus wpa_supplicant[907]: wlan0: CTRL-EVENT-DISCONNECTED bssid=00:24:fe:a3:98:f6 reason=6
May 14 16:52:27 terminus NetworkManager[868]: <warn> Connection disconnected (reason 6)
May 14 16:52:27 terminus wpa_supplicant[907]: wlan0: SME: Trying to authenticate with 00:24:fe:a3:98:f6 (SSID='FRITZ!Box Fon WLAN 7270' freq=2447 MHz)
May 14 16:52:27 terminus kernel: [ 4304.215024] cfg80211: Calling CRDA to update world regulatory domain
May 14 16:52:27 terminus kernel: [ 4304.215540] wlan0: authenticate with 00:24:fe:a3:98:f6
May 14 16:52:27 terminus NetworkManager[868]: <info> (wlan0): supplicant interface state: completed -> authenticating
May 14 16:52:27 terminus wpa_supplicant[907]: wlan0: Trying to associate with 00:24:fe:a3:98:f6 (SSID='FRITZ!Box Fon WLAN 7270' freq=2447 MHz)
May 14 16:52:27 terminus kernel: [ 4304.219680] wlan0: send auth to 00:24:fe:a3:98:f6 (try 1/3)
May 14 16:52:27 terminus kernel: [ 4304.222003] wlan0: authenticated
May 14 16:52:27 terminus kernel: [ 4304.222790] wlan0: associate with 00:24:fe:a3:98:f6 (try 1/3)
May 14 16:52:27 terminus kernel: [ 4304.223063] cfg80211: World regulatory domain updated:
May 14 16:52:27 terminus kernel: [ 4304.223072] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
May 14 16:52:27 terminus kernel: [ 4304.223078] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 14 16:52:27 terminus kernel: [ 4304.223083] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 14 16:52:27 terminus kernel: [ 4304.223087] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
May 14 16:52:27 terminus kernel: [ 4304.223090] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 14 16:52:27 terminus kernel: [ 4304.223094] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 14 16:52:27 terminus kernel: [ 4304.226833] wlan0: RX AssocResp from 00:24:fe:a3:98:f6 (capab=0x431 status=0 aid=1)
May 14 16:52:27 terminus NetworkManager[868]: <info> (wlan0): supplicant interface state: authenticating -> associating
May 14 16:52:27 terminus wpa_supplicant[907]: wlan0: Associated with 00:24:fe:a3:98:f6
May 14 16:52:27 terminus kernel: [ 4304.232953] wlan0: associated
May 14 16:52:27 terminus NetworkManager[868]: <info> (wlan0): supplicant interface state: associating -> 4-way handshake
May 14 16:52:27 terminus wpa_supplicant[907]: wlan0: WPA: Key negotiation completed with 00:24:fe:a3:98:f6 [PTK=CCMP GTK=TKIP]
May 14 16:52:27 terminus wpa_supplicant[907]: wlan0: CTRL-EVENT-CONNECTED - Connection to 00:24:fe:a3:98:f6 completed [id=0 id_str=]
May 14 16:52:27 terminus NetworkManager[868]: <info> (wlan0): supplicant interface state: 4-way handshake -> completed
May 14 16:53:55 terminus wpa_supplicant[907]: wlan0: CTRL-EVENT-SCAN-STARTED
May 14 16:54:00 terminus wpa_supplicant[907]: nl80211: send_and_recv->nl_recvmsgs failed: -33
May 14 16:54:05 terminus wpa_supplicant[907]: wlan0: WPA: Group rekeying completed with 00:24:fe:a3:98:f6 [GTK=TKIP]
Other relevant information:
root@terminus:~# lshw -c network
*-network
description: Wireless interface
product: Centrino Advanced-N 6230 [Rainbow Peak]
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlan0
version: 34
serial: 88:53:2e:42:0b:71
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=3.13.0-24-generic firmware=18.168.6.1 ip=192.168.3.22 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
resources: irq:52 memory:f1b00000-f1b01fff
root@terminus:~# lsmod
Module Size Used by
btrfs 835954 0
raid6_pq 97812 1 btrfs
xor 21411 1 btrfs
ufs 74890 0
qnx4 13317 0
hfsplus 107516 0
hfs 54677 0
minix 36140 0
ntfs 97369 0
msdos 17332 0
jfs 181348 0
xfs 912173 0
libcrc32c 12644 2 xfs,btrfs
ctr 13049 1
ccm 17773 1
nls_iso8859_1 12713 0
snd_hda_codec_hdmi 46207 1
snd_hda_codec_realtek 61438 1
joydev 17381 0
intel_rapl 18773 0
x86_pkg_temp_thermal 14205 0
intel_powerclamp 14705 0
coretemp 13435 0
kvm_intel 143060 0
kvm 451511 1 kvm_intel
dell_laptop 18168 0
dcdbas 14928 1 dell_laptop
crct10dif_pclmul 14289 0
crc32_pclmul 13113 0
ghash_clmulni_intel 13259 0
aesni_intel 55624 2
uvcvideo 80885 0
aes_x86_64 17131 1 aesni_intel
lrw 13286 1 aesni_intel
gf128mul 14951 1 lrw
videobuf2_vmalloc 13216 1 uvcvideo
glue_helper 13990 1 aesni_intel
ablk_helper 13597 1 aesni_intel
videobuf2_memops 13362 1 videobuf2_vmalloc
cryptd 20359 3 ghash_clmulni_intel,aesni_intel,ablk_helper
psmouse 102222 0
videobuf2_core 40664 1 uvcvideo
serio_raw 13462 0
videodev 134688 2 uvcvideo,videobuf2_core
rfcomm 69160 8
arc4 12608 2
bnep 19624 2
snd_hda_intel 52355 3
iwldvm 232285 0
snd_hda_codec 192906 3 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intel
mac80211 626489 1 iwldvm
nouveau 1097199 1
snd_hwdep 13602 1 snd_hda_codec
snd_pcm 102099 3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
btusb 32412 0
snd_page_alloc 18710 2 snd_pcm,snd_hda_intel
snd_seq_midi 13324 0
snd_seq_midi_event 14899 1 snd_seq_midi
bluetooth 395423 22 bnep,btusb,rfcomm
iwlwifi 169932 1 iwldvm
snd_rawmidi 30144 1 snd_seq_midi
i915 783485 3
dell_wmi 12761 0
lpc_ich 21080 0
sparse_keymap 13948 1 dell_wmi
snd_seq 61560 2 snd_seq_midi_event,snd_seq_midi
snd_seq_device 14497 3 snd_seq,snd_rawmidi,snd_seq_midi
mxm_wmi 13021 1 nouveau
snd_timer 29482 2 snd_pcm,snd_seq
cfg80211 484040 3 iwlwifi,mac80211,iwldvm
ttm 85115 1 nouveau
snd 69238 17 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_seq_midi
drm_kms_helper 52758 2 i915,nouveau
wmi 19177 3 dell_wmi,mxm_wmi,nouveau
drm 302817 7 ttm,i915,drm_kms_helper,nouveau
i2c_algo_bit 13413 2 i915,nouveau
soundcore 12680 1 snd
mei_me 18627 0
mei 82274 1 mei_me
mac_hid 13205 0
video 19476 2 i915,nouveau
parport_pc 32701 0
ppdev 17671 0
lp 17759 0
parport 42348 3 lp,ppdev,parport_pc
hid_generic 12548 0
usbhid 52616 0
hid 106148 2 hid_generic,usbhid
usb_storage 62209 0
ahci 25819 1
r8169 67581 0
libahci 32168 1 ahci
mii 13934 1 r8169
I guess it could be a hardware-related issue, but as far as I know, the problem does not occur on Windows (8, 64bit). However, since the reconnect is so fast, I might have missed it so far.
Any idea what the issue could be? What is "Reason 6" and what can cause it? How can I debug the problem further?
It seems like Network Issues since Trusty could be the same issue. I would appreciate if someone could post my link there, since I don't have enough reputation to do so.
I disabled mode-N wireless by adding 'options iwlwifi 11n_disable=1' to some file in /etc/modprobe.d/. I had no disconnects since then!
Best Answer
I have had similar issues, and found the following helped (not solved) my problem:
Check which regulatory agency your wireless is set to use:
Mine defaulted to '00', which is unset. As I'm in the US, I then ran
This setting for my wireless seems to have made the behaviour of my device much more consistent, although I am also running
in the file /etc/modprobe.d/iwlwifi.conf to disable the 802.11n protocol
and in the file /etc/sysctl.conf I am disabling the ipv6 protocols
and finally, my wireless router has been set not to use QOS/WWN