Ubuntu – Wifi connected but no internet, is this the end


this is my story:
I left my laptop at home connected to the router and with teamviewer on. Remotely I was controlling it about 2 hours, at a specific moment the connection has disapeared. When I came back, the laptop was on and still connected to the router but no internet connection.

  1. The router is fine, if I connect another device it works.
  2. I still can see other wifi networks and try to connect to them.
  3. I was not installing anything new software on it while controlling it remotely.
  4. Nobody touched it.
  5. It was not a power failure, everything was like I left it.
  6. Tried with a life cd, same situation
  7. Ubuntu 12.10 on Acer Aspire 7730


wlan0     Link encap:Ethernet  HWaddr 00:16:ea:a4:17:52  
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::216:eaff:fea4:1752/64 Scope:Link
          RX packets:15 errors:0 dropped:0 overruns:0 frame:0
          TX packets:48 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:4910 (4.9 KB)  TX bytes:13172 (13.1 KB)


wlan0     IEEE 802.11abgn  ESSID:"Real+"  
          Mode:Managed  Frequency:2.422 GHz  Access Point: 00:18:E7:FA:7F:5F   
          Bit Rate=58.5 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=-36 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:35   Missed beacon:0

route -n:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface         UG    0      0        0 wlan0   U     9      0        0 wlan0

ping -c4

PING ( 56(84) bytes of data.
--- ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3023ms

Interesting the default gateway ping works, ping

PING ( 56(84) bytes of data.
64 bytes from icmp_req=1 ttl=64 time=3.05 ms
64 bytes from icmp_req=2 ttl=64 time=6.23 ms
--- ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 3.051/4.644/6.237/1.593 ms

lspci -nn | grep 0280:

07:00.0 Network controller [0280]: Intel Corporation WiFi Link 5100 [8086:4232]

Is this a bad new and I have to buy a new wifi card?

Best Answer

Please open a terminal and do:

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

A new, empty file will open. Add one line:

options iwlwifi 11n_disable=1

Proofread, save and close gedit. Reboot and let us hear your report.

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