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After installing Ubuntu 12.04 a week ago wireless internet had been working fine. It stopped working yesterday, however, and I'm at a loss for what to do even after scouring replies to similar posted problems.

I have tried using Google's public DNS and turning off proxy settings on Firefox. I have used nm-tool and lshw to make sure my wireless device and driver are connected. If anyone can help me resolve this issue I would be extremely grateful!

Outputs:

$ ping -c3 www.google.com

ping: unknown host www.google.com

$ ping -c4 8.8.8.8

PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

From 192.168.1.104 icmp_seq=1 Destination Host Unreachable

...

--- 8.8.8.8 ping statistics ---

4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3014ms

$ cat /etc/resolv.conf

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) 

# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN 

nameserver 127.0.0.1

$ nm-tool | grep DNS

DNS: 192.168.1.1

$ route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 wlan0

169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0

192.168.1.0     0.0.0.0         255.255.255.0   U     2      0        0 wlan0

$ ping -c4 192.168.1.1

PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data

From 192.168.1.104 icmp_seq=1 Destination Host Unavailable

From 192.168.1.104 icmp_seq=2 Destination Host Unavailable



--- 192.168.1.1 ping statistics ---

4 packets transmitted, 0 received, +2 errors, 100% packet loss, time 2998ms

pipe 4

$ ifconfig

eth0      Link encap:Ethernet HWaddr 88:ae:1d:58:9d:0b

          UP BROADCAST MULTICAST MTU:1500 Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)



lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:16436  Metric:1

          RX packets:235 errors:0 dropped:0 overruns:0 frame:0

          TX packets:235 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0

          RX bytes:16266 (16.2 KB)  TX bytes:16266 (16.2 KB)



wlan0     Link encap:Ethernet  HWaddr 00:23:15:35:ce:2c

          inet addr:192.168.1.104  Bcast:192.168.1.255  Mask:255.255.255.0

          inet6 addr: fe80::223:15ff:fe35:ce2c/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:420 errors:0 dropped:0 overruns:0 frame:0

          TX packets:264 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:109306 (109.3 KB)  TX bytes:27642 (27.6 KB)



wmax0     Link encap:Ethernet  HWaddr 64:64:da:04:52:b5

          UP NOARP  MTU:1400  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:20

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

$ cat /etc/network/interfaces

auto lo

iface lo inet loopback

$ sudo lshw -C network

  *-network

       description: Ethernet interface

       product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller

       vendor: Realtek Semiconductor Co., Ltd.

       physical id: 0

       bus info: pci@0000:01:00.0

       logical name: eth0

       version: 05

       serial: 88:ae:1d:58:9d:0b

       size: 10Mbit/s

       capacity: 100Mbit/s

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation

       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl_nic/rtl8168e-2.fw

latency=0 link=no multicast=yes port=MII speed=10Mbit/s

       resources: irq:41 ioport:6000(size=256) memory:d0404000-d0404fff memory:d0400000-d0403fff

*-network

       description: Wireless interface

       product: Centrino Advanced-N + WiMAX 6250

       vendor: Intel Corporation

       physical id: 0

       bus info: pci@0000:06:00.0

       logical name: wlan0

       version: 57

       serial: 00:23:15:35:ce:2c

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

       configuration: broadcast=yes driver=iwlwifi driverversion=3.5.0-34-generic firmware=41.28.5.1 build 33926 ip=192.168.1.104 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn

       resources: irq:43 memory:d4600000-d4601fff

*-network

       description: Ethernet interface

       physical id: 2

       logical name: wmx0

       serial: 64:d4:da:04:52:b5

       capabilities: ethernet physical

       configuration: driver=i2400m_usb firmware=i6050-fw-usb-1.5.sbcf link=no

$ dmesg | grep iwl

[   15.388067] iwlwifi: Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:

[   15.388072] iwlwifi: Copyright(c) 2003-2012 Intel Corporation

[   15.388180] iwlwifi 0000:06:00.0: pci_resource_len = 0x00002000

[   15.388183] iwlwifi 0000:06:00.0: pci_resource_base = ffffc9000067c000

[   15.388186] iwlwifi 0000:06:00.0: HW Revision ID = 0x57

[   15.388263] iwlwifi 0000:06:00.0: irq 43 for MSI/MSI-X

[   15.391065] iwlwifi 0000:06:00.0: loaded firmware version 41.28.5.1 build 33926

[   15.391352] iwlwifi 0000:06:00.0: CONFIG_IWLWIFI_DEBUG disabled

[   15.391356] iwlwifi 0000:06:00.0: CONFIG_IWLWIFI_DEBUGFS enabled

[   15.391358] iwlwifi 0000:06:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled

[   15.391360] iwlwifi 0000:06:00.0: CONFIG_IWLWIFI_DEVICE_TESTMODE enabled

[   15.391362] iwlwifi 0000:06:00.0: CONFIG_IWLWIFI_P2P disabled

[   15.391365] iwlwifi 0000:06:00.0: Detected Intel(R) Centrino(R) Advanced-N + WiMAX 6250 AGN, REV=0x84

[   15.391427] iwlwifi 0000:06:00.0: L1 Enabled; Disabling L0S

[   15.399876] iwlwifi 0000:06:00.0: device EEPROM VER=0x552, CALIB=0x6

[   15.399880] iwlwifi 0000:06:00.0: Device SKU: 0x1F0

[   15.399883] iwlwifi 0000:06:00.0: Valid Tx ant: 0x3, Valid Rx ant: 0x3

[   15.399910] iwlwifi 0000:06:00.0: Tunable channels: 13 802.11bg, 24 802.11a channels

[   15.510715] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'

[   18.862936] iwlwifi 0000:06:00.0: L1 Enabled; Disabling L0S

[   18.863126] iwlwifi 0000:06:00.0: Radio type=0x1-0x2-0x0

[   19.106527] iwlwifi 0000:06:00.0: L1 Enabled; Disabling L0S

[   19.106721] iwlwifi 0000:06:00.0: Radio type=0x1-0x2-0x0

[ 3754.102289] iwlwifi 0000:06:00.0: RF_KILL bit toggled to disable radio.

[ 3754.102506] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3754.103049] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3754.114930] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3754.114945] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3754.114957] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3754.115002] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3754.115039] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3754.115049] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3754.116099] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3754.128114] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3754.138152] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3756.419608] iwlwifi 0000:06:00.0: RF_KILL bit toggled to enable radio.

[ 3756.421101] iwlwifi 0000:06:00.0: L1 Enabled; Disabling L0S

[ 3756.421286] iwlwifi 0000:06:00.0: Radio type=0x1-0x2-0x0

[ 3762.839399] iwlwifi 0000:06:00.0: RF_KILL bit toggled to disable radio.

[ 3762.840221] iwlwifi 0000:06:00.0: Not sending command - RF KILL

[ 3776.333700] iwlwifi 0000:06:00.0: RF_KILL bit toggled to enable radio.

[ 3776.335758] iwlwifi 0000:06:00.0: L1 Enabled; Disabling L0S

[ 3776.335951] iwlwifi 0000:06:00.0: Radio type=0x1-0x2-0x0

[ 4214.253483] iwlwifi 0000:06:00.0: L1 Enabled; Disabling L0S

[ 4214.253686] iwlwifi 0000:06:00.0: Radio type=0x1-0x2-0x0

[ 4305.514303] iwlwifi 0000:06:00.0: L1 Enabled; Disabling L0S

[ 4305.514509] iwlwifi 0000:06:00.0: Radio type=0x1-0x2-0x0

I had the same problem with the inbuilt network connections manager saying everything was fine, and ifconfig reporting the correct network addresses and that the connection was up and running, I could ping my laptop from the pc but had no internet access.

In my case it was down to also having a GUI network manager, Wicd, which must have been intercepting the connection, because by enabling the wireless lan via the GUI interface, the internet access came back up.

Hope this helps.