Internet connection not working after computer wakes up from sleep. OSX Lion

After upgrading to Lion, I noticed that my internet connection doesn't work when I wake my computer from sleep. I have to turn off the WiFi connection, turn it back on and it will work. I guess this is a glitch that will be fixed later on. Just wanted to point it out. I don't know if someone else is having the same problem? I am not very happy with the upgrade to Lion, things seem to be slower, I've had several freezes requiring to reboot. I guess Lion needed a little more twicking before release. Not worth the $29.99 price tag.

I had this problem on SL and on Lion as well, and it occures for WiFi and Ethernet connections.
In fact the internet connection was not broken as I could ping the destination usin the IP (not DNS name).
In this case the problem was related to mDNSResponder task which handles all dns queries.
It was the most frequent problem in my day to day work with SL and now Lion. It was never fixed by any patch from Apple. I tried almost all voodoo including fresh install, all possible config changes - no solution.
The only version with no problems related to network was 10.5.8. All the other versions had issues of different kind (WiFi instability (lost signal), DNS problems (for wireless and wired connection) sometimes associated with machine sleep and wake up and sometimes with no reason.
QUESTION: Is your problem independent of the access point / router you connect to.
I must say networking was (and still is) the weakest part, besides the other OS X weaknesses I experienced during 4 years of OS X usage.
No problems in the same network with Linux or Windows beeing ran natively on my iMac So hardware is OK.
Software is of poor quality. Not much more to say in this matter.
I found a very interesting article dated 1996 about programming which I think is still valid.
Link to the article: http://www.fastcompany.com/magazine/06/writestuff.html
Below the fragment (with some connection to Apple)
Software is everything. It also s***s.
"It's like pre-Sumerian civilization," says Brad Cox, who wrote the software for Steve Jobs NeXT computer and is a professor at George Mason University. "The way we build software is in the hunter-gatherer stage."

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    thunderbolt ethernet not working when computer wake up from sleep.
    it will not happen in Mountain loin.

    I had this problem on SL and on Lion as well, and it occures for WiFi and Ethernet connections.
    In fact the internet connection was not broken as I could ping the destination usin the IP (not DNS name).
    In this case the problem was related to mDNSResponder task which handles all dns queries.
    It was the most frequent problem in my day to day work with SL and now Lion. It was never fixed by any patch from Apple. I tried almost all voodoo including fresh install, all possible config changes - no solution.
    The only version with no problems related to network was 10.5.8. All the other versions had issues of different kind (WiFi instability (lost signal), DNS problems (for wireless and wired connection) sometimes associated with machine sleep and wake up and sometimes with no reason.
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    I must say networking was (and still is) the weakest part, besides the other OS X weaknesses I experienced during 4 years of OS X usage.
    No problems in the same network with Linux or Windows beeing ran natively on my iMac So hardware is OK.
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    I found a very interesting article dated 1996 about programming which I think is still valid.
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            TX packets 0  bytes 0 (0.0 B)
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            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 336  bytes 26572 (25.9 KiB)
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            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 22393  bytes 2574830 (2.4 MiB)
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    Dec  9 12:28:12 localhost NetworkManager[745]: <info> (wlan0): deactivating device (reason 'sleeping') [37]
    Dec  9 12:28:12 localhost dhcpcd[1927]: wlan0: removing interface
    Dec  9 12:28:12 localhost NetworkManager[745]: <info> (wlan0): canceled DHCP transaction, DHCP client pid 1927
    Dec  9 12:28:12 localhost NetworkManager[745]: <info> (wlan0): cleaning up...
    Dec  9 12:28:12 localhost NetworkManager[745]: <info> (wlan0): taking down device.
    Dec  9 12:28:13 localhost NetworkManager[745]: <warn> (pid 1927) unhandled DHCP event for interface wlan0
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    Last edited by geeky_sh (2011-12-09 07:27:37)

    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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