Ubuntu 12.04: Wireless network - connected, got ip, but no packets through (Fixed on 13.04)

Test if it running

Please try:

Code:

lsmod | grep iwl

See if your wireless driver is iwlagn or iwlwifi and then remove it and reload it with a parameter.

Code:

sudo modprobe -r iwlwifi
sudo modprobe iwlwifi 11n_disable=1

Any improvement? If so, we'll need to write one file to make it permanent.

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Do if the upper_test fixs your problem

The iwlwifi driver is troubled with a bug wherein it doesn't handle N traffic at all well. It seems to clog and pass NO traffic at all. Fortunately,there is a fix; tell the driver to disable ts N capability. It's a compromise, I know, but there seem to be two choices: it works without N or it doesn't work at all.

Please open a terminal and do:

Code:

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

Of course, use the actual name of your driver, if not iwlwifi. Write one line:

Code:

options iwlwifi 11n_disable=1

Proofread carefully, save and close gedit. 

reboot your system.