Wifi connects, can't ping router or external, since 12.04

[wildmanne39]

Hi, you can just reboot and the commands will be lost and if you want to test them again just run the commands again when you can not connect.
Thanks

[RobertSwipe]

Hi, you can just reboot and the commands will be lost and if you want to test them again just run the commands again when you can not connect.
Thanks

Thanks.

Tried a cold boot, and the problem came back. I ran your commands and everything works fine.

However, I tried another cold boot (problem came back), and this time I ran just:
sudo ifconfig wlan0 down
sudo ifconfig wlan0 up

...and wifi worked.

So I'm a bit lost now! It seems that simply restarting the wifi sorts out the connection problem. On first booting, the network manager icon shows I'm connected, and also identifies it as connected to my home wireless network. Why would switching the connection off then on make any difference?

I am grateful for your help.

[wildmanne39]

Hi, let's make the change persistent and see if that fixes your issue, if not we can write another config file that should work.

gksudo gedit /etc/modprobe.d/iwlwifi.conf

Then add one line:

options iwlwifi 11n_disable=1

save gedit,close.
Reboot
Thanks

[RobertSwipe]

Hi, let's make the change persistent and see if that fixes your issue, if not we can write another config file that should work.

gksudo gedit /etc/modprobe.d/iwlwifi.conf

Then add one line:

options iwlwifi 11n_disable=1

save gedit,close.
Reboot
Thanks

Tried this and a cold reboot and..... (drum roll)....
It's worked!

Presumably this means my wifi has 802.11n disabled? Hey, if it works, I'm not too bothered - g is still operational.

Once again, thanks!

[wildmanne39]

Hi, your welcome! please use thread tools at the top of the page to mark the thread solved.
Thanks

[JuhazOne]

Hi, please try:

sudo ifconfig wlan0 down
sudo rmmod -f iwlwifi
sudo modprobe iwlwifi 11n_disable=1
sudo ifconfig wlan0 up

does it connect now? this is just for testing so do not reboot if it works we will need to make it permanent.
Thanks

Interesting. The commands ifconfig wlan0 down and ifconfig wlan0 up fixed the issue for me at least today.

It seems that my kernel didn't have the module iwlwifi loaded so it couldn't be unloaded either. I guess my corresponding kernel module would be r8169. I may try troubleshooting this again next weekend, so I'd appreciate if anyone cares to analyze the output of my computer when given wildmanne39's commands:

$ cat /etc/lsb-release; uname -a
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=11.10
DISTRIB_CODENAME=oneiric
DISTRIB_DESCRIPTION="Ubuntu 11.10"
Linux myhostname 3.0.0-19-generic #33-Ubuntu SMP Thu Apr 19 19:05:14 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
$ lspci -nnk | grep -iA2 net
03:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6205 [8086:0085] (rev 34)
        Subsystem: Intel Corporation Centrino Advanced-N 6205 AGN [8086:1311]
        Kernel driver in use: iwlagn
--
09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 03)
        Subsystem: Lenovo Device [17aa:21dd]
        Kernel driver in use: r8169
$ 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 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 017: ID 0409:0058 NEC Corp. HighSpeed Hub
Bus 001 Device 004: ID 147e:1002 Upek 
Bus 001 Device 005: ID 0a5c:217f Broadcom Corp. Bluetooth Controller
Bus 002 Device 003: ID 5986:03b4 Acer, Inc 
Bus 001 Device 018: ID 046d:c312 Logitech, Inc. DeLuxe 250 Keyboard
Bus 001 Device 019: ID 0b33:0700 Contour Design, Inc. 
$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11abgn  ESSID:"foobar"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: 00:23:08:CB:CC:28   
          Bit Rate=150 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=70/70  Signal level=-24 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:21550  Invalid misc:483   Missed beacon:0

vmnet1    no wireless extensions.

vmnet8    no wireless extensions.

$ rfkill list all
0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
1: tpacpi_bluetooth_sw: Bluetooth
        Soft blocked: no
        Hard blocked: no
2: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
$ lsmod
Module                  Size  Used by
ipt_REDIRECT           12549  10 
xt_tcpudp              12603  10 
iptable_nat            13229  1 
nf_nat                 25890  2 ipt_REDIRECT,iptable_nat
nf_conntrack_ipv4      19716  3 iptable_nat,nf_nat
nf_conntrack           82342  3 iptable_nat,nf_nat,nf_conntrack_ipv4
nf_defrag_ipv4         12729  1 nf_conntrack_ipv4
ip_tables              27473  1 iptable_nat
x_tables               29846  4 ipt_REDIRECT,xt_tcpudp,iptable_nat,ip_tables
vmnet                  55617  13 
vsock                  52475  0 
vmci                   86575  1 vsock
vmmon                  80498  0 
bnep                   18436  2 
rfcomm                 47946  12 
parport_pc             36962  0 
ppdev                  17113  0 
binfmt_misc            17540  1 
dm_crypt               23199  0 
snd_hda_codec_hdmi     32040  1 
snd_hda_codec_realtek   330815  1 
arc4                   12529  2 
joydev                 17693  0 
uvcvideo               72711  0 
videodev               93004  1 uvcvideo
v4l2_compat_ioctl32    17083  1 videodev
thinkpad_acpi          81819  0 
nvram                  14413  1 thinkpad_acpi
tpm_tis                18546  0 
snd_hda_intel          33390  2 
snd_hda_codec         104968  3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep              13668  1 snd_hda_codec
snd_pcm                96714  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_seq_midi           13324  0 
snd_rawmidi            30547  1 snd_seq_midi
snd_seq_midi_event     14899  1 snd_seq_midi
snd_seq                61896  2 snd_seq_midi,snd_seq_midi_event
btusb                  18600  1 
snd_timer              29991  2 snd_pcm,snd_seq
iwlagn                314257  0 
snd_seq_device         14540  3 snd_seq_midi,snd_rawmidi,snd_seq
snd                    68266  15 snd_hda_codec_hdmi,snd_hda_codec_realtek,thinkpad_acpi,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
mac80211              462046  1 iwlagn
psmouse                73882  0 
serio_raw              13166  0 
cfg80211              199630  2 iwlagn,mac80211
bluetooth             166150  23 bnep,rfcomm,btusb
rts_pstor             445246  0 
soundcore              12680  1 snd
snd_page_alloc         18529  2 snd_hda_intel,snd_pcm
mei                    41480  0 
lp                     17799  0 
parport                46562  3 parport_pc,ppdev,lp
usbhid                 47198  0 
hid                    95463  1 usbhid
i915                  571299  3 
ahci                   26002  2 
libahci                26861  1 ahci
drm_kms_helper         42558  1 i915
drm                   236290  4 i915,drm_kms_helper
r8169                  52788  0 
i2c_algo_bit           13423  1 i915
wmi                    19256  0 
video                  19597  1 i915

[wildmanne39]

Hi do what is in post 13 and the 2 places that is says iwlwifi type iwlagn.
Thanks

[JuhazOne]

Hi do what is in post 13 and the 2 places that is says iwlwifi type iwlagn.
Thanks

Thanks for the help... But it seems that I can't even reproduce the problem right now even though I haven't touched anything under /etc/modprobe.d and I just rebooted the computer. Maybe I'll try something if the problem comes back. Anyway, thanks for your help again.

[m0116815]

Hi guys,

On my end, the problem seems to have solved itself organically. Not sure why, but I'll not mess with it now

[wildmanne39]

Hi, I hope it lasts but an issue not fixed usually comes back.
Thanks