Wireless Connected But No Internet Connection (Ubuntu 12.04)

I am using same network for 2 days and everything was normal. However, today even though it shows me as connected to the network, I do not have internet connection. If I use ethernet cable instead of wireless, I am still able to connect to the internet. Also my friends are able to connect to the wireless network and they can get internet connection. I did not update or install anything since yesterday. Therefore I do not have any idea why it is happening. Here is some information about my connection:

I will be appreciate to any kind of help.

    root@ghostrider:/etc/resolvconf#     ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_req=1 ttl=64 time=0.042 ms
64 bytes from 127.0.0.1: icmp_req=2 ttl=64 time=0.023 ms
64 bytes from 127.0.0.1: icmp_req=3 ttl=64 time=0.036 ms
64 bytes from 127.0.0.1: icmp_req=4 ttl=64 time=0.040 ms
^C
--- 127.0.0.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2998ms
rtt min/avg/max/mdev = 0.023/0.035/0.042/0.008 ms 
root@ghostrider:/etc/resolvconf# ping 192.168.1.3
PING 192.168.1.3 (192.168.1.3) 56(84) bytes of data.
^C
--- 192.168.1.3 ping statistics ---
19 packets transmitted, 0 received, 100% packet loss, time 18143ms

root@ghostrider:/etc/resolvconf# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
11 packets transmitted, 0 received, 100% packet loss, time 10079ms



root@ghostrider:/etc/resolvconf# cat /etc/lsb-release; uname -a
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04 LTS"
Linux ghostrider 3.2.0-24-generic-pae #39-Ubuntu SMP Mon May 21 18:54:21 UTC 2012 i686     i686 i386 GNU/Linux
root@ghostrider:/etc/resolvconf# lspci -nnk | grep -iA2 net
03:00.0 Ethernet controller [0200]: Atheros Communications Inc. AR8131 Gigabit     Ethernet [1969:1063] (rev c0)
Subsystem: Lenovo Device [17aa:3956]
Kernel driver in use: atl1c
--
04:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11b/g/n         Wireless LAN Controller [14e4:4727] (rev 01)
Subsystem: Broadcom Corporation Device [14e4:0510]
Kernel driver in use: wl
root@ghostrider:/etc/resolvconf# 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 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 007: ID 0489:e00d Foxconn / Hon Hai 
Bus 001 Device 004: ID 1c7a:0801 LighTuning Technology Inc. Fingerprint Reader
Bus 001 Device 005: ID 064e:f219 Suyin Corp. 
Bus 002 Device 010: ID 0424:2412 Standard Microsystems Corp. 
Bus 002 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 002 Device 011: ID 0403:6010 Future Technology Devices International, Ltd     FT2232C Dual USB-UART/FIFO IC
root@ghostrider:/etc/resolvconf# iwconfig
lo        no wireless extensions.

eth1      IEEE 802.11  ESSID:"PoliTekno"  
      Mode:Managed  Frequency:2.462 GHz  Access Point: 00:16:E3:40:C3:E4   
      Bit Rate=54 Mb/s   Tx-Power:24 dBm   
      Retry min limit:7   RTS thr:off   Fragment thr:off
      Power Management:off
      Link Quality=5/5  Signal level=-52 dBm  Noise level=-97 dBm
      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.

root@ghostrider:/etc/resolvconf# rfkill list all
0: brcmwl-0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
2: ideapad_bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
5: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
root@ghostrider:/etc/resolvconf# lsmod
Module                  Size  Used by
nls_iso8859_1          12617  0 
nls_cp437              12751  0 
vfat                   17308  0 
fat                    55605  1 vfat
usb_storage            39646  0 
uas                    17828  0 
snd_hda_codec_realtek   174055  1 
rfcomm                 38139  12 
parport_pc             32114  0 
ppdev                  12849  0 
bnep                   17830  2 
joydev                 17393  0 
ftdi_sio               35859  1 
usbserial              37173  3 ftdi_sio
snd_hda_intel          32765  3 
snd_hda_codec         109562  2 snd_hda_codec_realtek,snd_hda_intel
snd_hwdep              13276  1 snd_hda_codec
acer_wmi               23612  0 
hid_logitech_dj        18177  0 
snd_pcm                80845  2 snd_hda_intel,snd_hda_codec
uvcvideo               67203  0 
btusb                  17912  2 
snd_seq_midi           13132  0 
videodev               86588  1 uvcvideo
bluetooth             158438  23 rfcomm,bnep,btusb
psmouse                72919  0 
usbhid                 41906  1 hid_logitech_dj
snd_rawmidi            25424  1 snd_seq_midi
intel_ips              17753  0 
serio_raw              13027  0 



    root@ghostrider:/etc/resolvconf#     ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_req=1 ttl=64 time=0.042 ms
64 bytes from 127.0.0.1: icmp_req=2 ttl=64 time=0.023 ms
64 bytes from 127.0.0.1: icmp_req=3 ttl=64 time=0.036 ms
64 bytes from 127.0.0.1: icmp_req=4 ttl=64 time=0.040 ms
^C
--- 127.0.0.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2998ms
rtt min/avg/max/mdev = 0.023/0.035/0.042/0.008 ms 
root@ghostrider:/etc/resolvconf# ping 192.168.1.3
PING 192.168.1.3 (192.168.1.3) 56(84) bytes of data.
^C
--- 192.168.1.3 ping statistics ---
19 packets transmitted, 0 received, 100% packet loss, time 18143ms

root@ghostrider:/etc/resolvconf# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
11 packets transmitted, 0 received, 100% packet loss, time 10079ms



root@ghostrider:/etc/resolvconf# cat /etc/lsb-release; uname -a
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04 LTS"
Linux ghostrider 3.2.0-24-generic-pae #39-Ubuntu SMP Mon May 21 18:54:21 UTC 2012 i686     i686 i386 GNU/Linux
root@ghostrider:/etc/resolvconf# lspci -nnk | grep -iA2 net
03:00.0 Ethernet controller [0200]: Atheros Communications Inc. AR8131 Gigabit     Ethernet [1969:1063] (rev c0)
Subsystem: Lenovo Device [17aa:3956]
Kernel driver in use: atl1c
--
04:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11b/g/n         Wireless LAN Controller [14e4:4727] (rev 01)
Subsystem: Broadcom Corporation Device [14e4:0510]
Kernel driver in use: wl
root@ghostrider:/etc/resolvconf# 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 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 007: ID 0489:e00d Foxconn / Hon Hai 
Bus 001 Device 004: ID 1c7a:0801 LighTuning Technology Inc. Fingerprint Reader
Bus 001 Device 005: ID 064e:f219 Suyin Corp. 
Bus 002 Device 010: ID 0424:2412 Standard Microsystems Corp. 
Bus 002 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 002 Device 011: ID 0403:6010 Future Technology Devices International, Ltd     FT2232C Dual USB-UART/FIFO IC
root@ghostrider:/etc/resolvconf# iwconfig
lo        no wireless extensions.

eth1      IEEE 802.11  ESSID:"PoliTekno"  
      Mode:Managed  Frequency:2.462 GHz  Access Point: 00:16:E3:40:C3:E4   
      Bit Rate=54 Mb/s   Tx-Power:24 dBm   
      Retry min limit:7   RTS thr:off   Fragment thr:off
      Power Management:off
      Link Quality=5/5  Signal level=-52 dBm  Noise level=-97 dBm
      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.

root@ghostrider:/etc/resolvconf# rfkill list all
0: brcmwl-0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
2: ideapad_bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
5: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
root@ghostrider:/etc/resolvconf# lsmod
Module                  Size  Used by
nls_iso8859_1          12617  0 
nls_cp437              12751  0 
vfat                   17308  0 
fat                    55605  1 vfat
usb_storage            39646  0 
uas                    17828  0 
snd_hda_codec_realtek   174055  1 
rfcomm                 38139  12 
parport_pc             32114  0 
ppdev                  12849  0 
bnep                   17830  2 
joydev                 17393  0 
ftdi_sio               35859  1 
usbserial              37173  3 ftdi_sio
snd_hda_intel          32765  3 
snd_hda_codec         109562  2 snd_hda_codec_realtek,snd_hda_intel
snd_hwdep              13276  1 snd_hda_codec
acer_wmi               23612  0 
hid_logitech_dj        18177  0 
snd_pcm                80845  2 snd_hda_intel,snd_hda_codec
uvcvideo               67203  0 
btusb                  17912  2 
snd_seq_midi           13132  0 
videodev               86588  1 uvcvideo
bluetooth             158438  23 rfcomm,bnep,btusb
psmouse                72919  0 
usbhid                 41906  1 hid_logitech_dj
snd_rawmidi            25424  1 snd_seq_midi
intel_ips              17753  0 
serio_raw              13027  0 
hid                    77367  2 hid_logitech_dj,usbhid
ideapad_laptop         17890  0 
sparse_keymap          13658  2 acer_wmi,ideapad_laptop
lib80211_crypt_tkip    17275  0 
snd_seq_midi_event     14475  1 snd_seq_midi
snd_seq                51567  2 snd_seq_midi,snd_seq_midi_event
wl                   2646601  0 
wmi                    18744  1 acer_wmi
i915                  414672  3 
drm_kms_helper         45466  1 i915
snd_timer              28931  2 snd_pcm,snd_seq
mac_hid                13077  0 
snd_seq_device         14172  3 snd_seq_midi,snd_rawmidi,snd_seq
lib80211               14040  2 lib80211_crypt_tkip,wl
drm                   197692  4 i915,drm_kms_helper
i2c_algo_bit           13199  1 i915
snd                    62064  15         snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_se    q,snd_timer,snd_seq_device
video                  19068  1 i915
mei                    36570  0 
soundcore              14635  1 snd
snd_page_alloc         14108  2 snd_hda_intel,snd_pcm
lp                     17455  0 
parport                40930  3 parport_pc,ppdev,lp
atl1c                  36718  0 
root@ghostrider:/etc/resolvconf# nm-tool

NetworkManager Tool

State: connected (global)

- Device: eth1  [PoliTekno] ----------------------------------------------------
  Type:              802.11 WiFi
  Driver:            wl
  State:             connected
  Default:           yes
  HW Address:        AC:81:12:7F:6B:B2

  Capabilities:
    Speed:           54 Mb/s

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

  Wireless Access Points (* = current AP)
    CnDStudios:      Infra, 00:12:BF:3F:0A:8A, Freq 2412 MHz, Rate 54 Mb/s, Strength 85 WPA
    AIR_TIES:        Infra, 00:1C:A8:6E:84:32, Freq 2462 MHz, Rate 54 Mb/s, Strength 72 WPA2
    VKSS:            Infra, 00:E0:4D:01:0D:47, Freq 2452 MHz, Rate 54 Mb/s, Strength 62 WPA2
    PROGEDA:         Infra, 00:1A:2A:60:BF:61, Freq 2462 MHz, Rate 54 Mb/s, Strength 47 WPA
    MobilAtolye:     Infra, 72:2B:C1:65:75:3C, Freq 2422 MHz, Rate 54 Mb/s, Strength 35 WPA WPA2
    AIRTIES_WAR-141: Infra, 00:1C:A8:AB:AA:48, Freq 2422 MHz, Rate 54 Mb/s, Strength 35 WPA WPA2
    tilda_biri_yeni: Infra, 54:E6:FC:B0:3C:E9, Freq 2437 MHz, Rate 0 Mb/s, Strength 34 WEP
    *PoliTekno:      Infra, 00:16:E3:40:C3:E4, Freq 2462 MHz, Rate 54 Mb/s, Strength 100 WPA2
    AIRTIES_RJY:     Infra, 00:1A:2A:BD:85:16, Freq 2462 MHz, Rate 54 Mb/s, Strength 55 WEP

  IPv4 Settings:
    Address:         0.0.0.0
    Prefix:          24 (255.255.255.0)
    Gateway:         192.168.1.1

    DNS:             192.168.1.1


- Device: eth0 -----------------------------------------------------------------
  Type:              Wired
  Driver:            atl1c
  State:             unavailable
  Default:           no
  HW Address:        F0:DE:F1:6C:90:65

  Capabilities:
    Carrier Detect:  yes
    Speed:           100 Mb/s

  Wired Properties
    Carrier:         off


root@ghostrider:/etc/resolvconf# sudo iwlist scan
lo        Interface doesn't support scanning.

eth1      Scan completed :
          Cell 01 - Address: 00:16:E3:40:C3:E4
                ESSID:"PoliTekno"
                Mode:Managed
                Frequency:2.462 GHz (Channel 11)
                Quality:5/5  Signal level:-48 dBm  Noise level:-98 dBm
                IE: IEEE 802.11i/WPA2 Version 1
                    Group Cipher : CCMP
                    Pairwise Ciphers (1) : CCMP
                    Authentication Suites (1) : PSK
                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
      Cell 02 - Address: 00:E0:4D:01:0D:47
                ESSID:"VKSS"
                Mode:Managed
                Frequency:2.452 GHz (Channel 9)
                Quality:4/5  Signal level:-64 dBm  Noise level:-98 dBm
                IE: IEEE 802.11i/WPA2 Version 1
                    Group Cipher : CCMP
                    Pairwise Ciphers (1) : CCMP
                    Authentication Suites (1) : PSK
                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
      Cell 03 - Address: 00:1C:A8:AB:AA:48
                ESSID:"AIRTIES_WAR-141"
                Mode:Managed
                Frequency:2.422 GHz (Channel 3)
                Quality:2/5  Signal level:-77 dBm  Noise level:-95 dBm
                IE: IEEE 802.11i/WPA2 Version 1
                    Group Cipher : TKIP
                    Pairwise Ciphers (2) : CCMP TKIP
                    Authentication Suites (1) : PSK
                IE: Unknown:     DDB20050F204104A0001101049001E007FC5100018DE7CF0D8B70223A62711C18926AC290E30303030303139631044000102103B0001031047001076B31BC241E953CB99C3872554425A28102100194169725469657320576972656C657373204E6574776F726B73102300074169723534343010240008312E322E302E31321042000F4154303939313131383030323832351054000800060050F20400011011000741697235343430100800020084103C000103
                IE: WPA Version 1
                    Group Cipher : TKIP
                    Pairwise Ciphers (2) : CCMP TKIP
                    Authentication Suites (1) : PSK
                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
      Cell 04 - Address: 72:2B:C1:65:75:3C
                ESSID:"MobilAtolye"
                Mode:Managed
                Frequency:2.422 GHz (Channel 3)
                Quality:2/5  Signal level:-78 dBm  Noise level:-92 dBm
                IE: IEEE 802.11i/WPA2 Version 1
                    Group Cipher : TKIP
                    Pairwise Ciphers (2) : TKIP CCMP
                    Authentication Suites (1) : PSK
                IE: Unknown: DDA20050F204104A0001101044000102103B00010310470010BC329E001DD811B28601722BC165753C1021001D48756177656920546563686E6F6C6F6769657320436F2E2C204C74642E1023001C48756177656920576972656C6573732041636365737320506F696E74102400065254323836301042000831323334353637381054000800060050F204000110110009487561776569415053100800020084103C000100
                IE: WPA Version 1
                    Group Cipher : TKIP
                    Pairwise Ciphers (2) : TKIP CCMP
                    Authentication Suites (1) : PSK
                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
      Cell 05 - Address: 00:12:BF:3F:0A:8A
                ESSID:"CnDStudios"
                Mode:Managed
                Frequency:2.412 GHz (Channel 1)
                Quality:5/5  Signal level:-47 dBm  Noise level:-95 dBm
                IE: WPA Version 1
                    Group Cipher : TKIP
                    Pairwise Ciphers (1) : TKIP
                    Authentication Suites (1) : PSK
                Encryption key:on
                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 22 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
      Cell 06 - Address: 00:1C:A8:6E:84:32
                ESSID:"AIR_TIES"
                Mode:Managed
                Frequency:2.462 GHz (Channel 11)
                Quality:5/5  Signal level:-56 dBm  Noise level:-98 dBm
                IE: IEEE 802.11i/WPA2 Version 1
                    Group Cipher : CCMP
                    Pairwise Ciphers (1) : CCMP
                    Authentication Suites (1) : PSK
                Encryption key:on
                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 22 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
      Cell 07 - Address: 54:E6:FC:B0:3C:E9
                ESSID:"tilda_biri_yeni"
                Mode:Managed
                Frequency:2.437 GHz (Channel 6)
                Quality:1/5  Signal level:-85 dBm  Noise level:-99 dBm
                Encryption key:on
                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                          12 Mb/s; 24 Mb/s; 36 Mb/s; 9 Mb/s; 18 Mb/s
                          48 Mb/s; 54 Mb/s
      Cell 08 - Address: 18:28:61:16:57:C3
                ESSID:"obilet"
                Mode:Managed
                Frequency:2.437 GHz (Channel 6)
                Quality:1/5  Signal level:-88 dBm  Noise level:-99 dBm
                IE: IEEE 802.11i/WPA2 Version 1
                    Group Cipher : TKIP
                    Pairwise Ciphers (2) : CCMP TKIP
                    Authentication Suites (1) : PSK
                IE: WPA Version 1
                    Group Cipher : TKIP
                    Pairwise Ciphers (2) : CCMP TKIP
                    Authentication Suites (1) : PSK
                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
      Cell 09 - Address: 00:1A:2A:60:BF:61
                ESSID:"PROGEDA"
                Mode:Managed
                Frequency:2.462 GHz (Channel 11)
                Quality:2/5  Signal level:-75 dBm  Noise level:-98 dBm
                IE: WPA Version 1
                    Group Cipher : TKIP
                    Pairwise Ciphers (1) : TKIP
                    Authentication Suites (1) : PSK
                Encryption key:on
                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 22 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

    eth0      Interface doesn't support scanning.

Solution 1:

You can also check /var/log/syslog for errors using your editor.

If you are connected to a DHCP server(mostly the gateway), try manually get a ip lease using dhclient eth1.

Try pinging to your gateway to check if you are connected to it.

Solution 2:

I experienced the same problem , but I fixed it by changing router settings. I switched Channel selection from AUTO to 1. Apparently my problem occurred when automatically a Channel>11 was selected. In fact, my problem didn't occur continuously.

For more details: Bug report on launchpad

My wireless device: Broadcom Corporation BCM43225 802.11b/g/n

Solution 3:

Seems that you don't have a IP address.

  IPv4 Settings:
Address:         0.0.0.0 <----- NO IP
Prefix:          24 (255.255.255.0)
Gateway:         192.168.1.1

DNS:             192.168.1.1

Check IP with

 ifconfig

and route with

 route -n