Internet connection does not work when Macbook wakes up from sleep

I recently installed MAC OSX LION. After that whenever the macbook pro wakes up from sleep, the internet connection does not work. I get a message 'DNS lookup failed'. I have to Turn off the WIFI and turn it back on every time. Has anyone come across this?

Same problem here. But I am afraid it has nothing to do with Safari because I don't even have Safari open. When it wakes from sleep, it has no internet connection and i cannot get me mail unless I shut wifi off and then back on. This happened back at the start of Snow Leopard too and it was something Apple eventually fixed.

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    Well, the above two links have the problem similar to mine but not exactly. In first one there is a problem with network manager - that it is unable to restart after coming from sleep mode while that is not a problem in my case and I tried all the solutions provided in the second link, but didn't work.
    What I figured is when I execute '#pm-suspend' and then close the lid. Then, after I open the lid I wireless works fine. 'pm-suspend' is not invoked if I close the lid. So I needed to invoke the above command when an acpi event is generated when I close the lid. So here is what I added in the /etc/acpi/handler.sh file
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