Suddenly, my iPad does not have internet connectivity

Despite strong wifi signals - a 4 bar icon at the top left on my Ipad and iTouch - both on my home network and on the network at a friends, my iPad (IOS 4.3.1) and my 2nd gen iTouch (IOS 4.1) both tell me that I am not connected to the Internet. Nor can I send or receive e-mail.
I have reset network setting; I have renewed the lease and have also fogot the network. I have powered off and then powered on. All to no avail.
I am typing this on my wireless G4 Powerbook while connected to my home system, so the problem does not seem to be with the router.
Hopefully this forum can help me solve this.
Thanks.

Quick inquiry. When you go to Settings/General/Network/Wi-Fi and tap the arrow to the right of the network your iPad thinks that it is connected with, what is the IP address? Is it a 169... IP? If so the iPad is not really connected to anything. It has timed out waiting on the router to supply it with a connection and supplied it own self assigned IP.
Carolyn has given you a link to all of Apple's best knowledge Base articles on Wi-Fi, and each of them are often links to more.
I hope that you sort it out.
Dah•veed

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