Wireless connection lost after macbook pro sleeps for more than 15 minutes

It's annoying. I have a brand new macbookpro 3.06Ghz 17" hi-res screen running OS-X 10.6.3 and the wireless connection keeps dropping after the computer is either turned off or sleeping for more than 15 minutes.
My router is a linksys wireless G, has dd-wrt software in it which is very powerful. When I release or renew the DHCP at the router, the mackbook connects to the wireless network, no problem.
What configuration can be done at the macbook as to not have it time-out airport wireless connections unless I renew/release DHCP at the router? This is an annoyance beyond the limits of anyone's patience.... Thanks in advance for any help!

Well, since nobody answered this post I decided to try a bunch of things and I believe I came to a solution:
1 - Make airport the first connection under System Preferences->Network
2 - In the advanced window:
- Under AirPort: Keep only one network name on the list (the one you use all the time)
- Select 'remember networks this computer has joined' and deselect all other boxes
- Take note of the Airport ID (xx:xx:xx:xx:xx) and put it in your router's MAC address list. I do this because I only allow connections to my router from mac IDs that are on the list I create. In my case, I have my macbook pro and my PS3 system. If you don't know how to edit the MAC list in your router, do some research. It's pretty easy.
- Under TCP/IP: Select "Using DHCP" on the IPv4 drop box
- Select "Off" for IPV6 drop box
- Under DNS, after you connect at least once, you should see (grayed out) your router's IP address on the left box and the domain on the right side box.
Finally, under "Ethernet" you should see your Mac address there, the configure option should be set to Automatically and MTU as standard (1500).
Press OK and then press "Apply" and lock that screen by clicking on the padlock at the bottom left. BTW on the top of this screen Location should be "Automatic" - if not, select it and apply.
Done! Your wireless should connect quickly after the computer is turned on or waken up from sleep state. This assumes you configured your router correctly (mac addresses, frequencies, etc).
Good Luck to all who try this - at least I have not have any more dropped wireless connections.
Message was edited by: KEForex
Message was edited by: KEForex

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