Network Diagnostics gives me all green, but Safari says no Internet connection

Whenever I awake my computer from sleep, it takes about a full minute or more (haven't timed it yet) before it will recognize my Internet connection. As soon as I open it, it automatically connects to my home network, but if I try to use the Internet in any way, I can't. Safari tells me I have no Internet connection. When I open Network Diagnostics as it suggests, I have all green lights. I can go all the way through Network Diagnostics, finish still with all green lights, and Safari still says no Internet connection. If I give it about a minute, I can reload the page, and everything will be fine…until I close the lid.
Any ideas? This is driving me crazy.
Other potentially helpful information:
I was away for the summer. Before I left, I did not have this problem. While I was away, I upgraded to Lion, but I didn't have this problem on any networks before or after the upgrade until I came back home. As far as I can tell, none of the other notebooks here (all Macs) have this problem. Weird, right? They are all running Snow Leopard or Leopard, though, come to think of it. So perhaps it is a combination of the network and Lion?

I've had that problem before, but when that was the problem, the computer was still trying to connect to the network and I didn't have green lights from Network Diagnostics. In this case, my computer connects instantly, I get all green lights from ND, and I still can't use the Internet for about two minutes. Everything looks fine in the network settings, green light on Wi-Fi, gives me an IP address, etc.
Is there another program besides Network Diagnostics that could tell me exactly where I'm not getting through?

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Network Diagnostics gives me all green, but Safari says no Internet connection

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