I also have an Intel Corporation Centrino Ultimate-N 6300 card in my laptop. I 
tried everything, but no solution. Kernel 3.0 worked while I have the problem 
since 3.1.  Today I noticed something important:
All the problems only appear with encrypted wifi. I noticed that, because I 
came across a free hot spot, and there it worked perfectly! If I am at home I 
can access to my WPA2 encrypted wifi, but I can't access to any webpage, which 
means I have no access to internet. This problems seems to be an encryption 
problem. (WPA for sure, I haven't tested any WEP wifi). All "solutions" I tried 
didn't work. I'm talking about kernels offered by archlinux. I tried orneiric 
on the live-cd version and there everything worked. Ubuntu 12.04 doesn't work.

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https://bugs.launchpad.net/bugs/836250

Title:
  [Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
  networking, packet loss and very slow Lenovo X201 and T500 laptops

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