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I boot into ubuntu and it connects to the Wifi network fine. After about 10-15min the DNS stop resolving any website and a couple of minutes later network-managers tells me that I'm disconnected and tries to reconnect constantly to my router and fails to do it. Upon Ubuntu restart everything works fine for the first 10-15min again. When I boot into Mac OS X everything is fine with the same connection!

How do I restart wifi interface? sudo ifdow wlan0 just tells me that wlan0 is not configured and wlan0 doesn't appear in /etc/network/interfaces either, which I find strange.... (unless network-manager is doing it behind my back).

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This looks like a problem with wifi driver. It is unlikely that you will be able to resolve it by just "restarting" network interface. Could you please show the output of lshw -class network? –  ulidtko Feb 13 '11 at 0:04
    
Must be closed as "No hope". –  mlvljr Nov 13 '12 at 18:48
    
I've changed my laptop since this was filed.... –  Dima Nov 15 '12 at 22:20

2 Answers 2

I would have a look at dmesg too, and, after loosing connection, at the last messages of dmesg:

dmesg | tail 

Maybe dropping and reloading your wifi-module helps:

sudo rmmod ipw2100
sudo modprobe ipw2100

for example, for the intel-chipset. I had random problem with this chispset, which went away, after setting the IRQ in the BIOS.

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For me it was iwldvm –  Dmitry Pashkevich Mar 29 at 18:24

You could try to find your wi-fi controller with lspci:

lspci | grep Network

I'd the same problem here (using Maverick, I think it's a known bug), and I fixed it with rmmod + modprobe trick as @user unknown answered. Here I'm using a Realtek RTL8191SEvA device, which driver is named r8192se_pci.

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