Iphone connects to router, won't connect to internet

Question

Searching back through the forums, there seem to be some kinda similar problems, and individually anecdotal solutions to them, but I wanted to see if anyone is experiencing something similar to my problem and/or has a definitive solution.
I can connect to my wifi router (d-link dir-625) no problem. iphone shows a strong connection and I can even access the router's configuration and settings site in safari.
I cannot, however, access anything that requires an internet connection (web pages, weather, etc.) when connected to the router. Safari just hangs while trying to access any web page and eventually gives an "sfari could not open the page because the server stopped responding" message.
This has happened with 2.0 and 2.0.1 and 2.0.2. Didn't have this problem with the 1.whatevers. I've repeatedly tried to renew the lease, forget the network, and tried multiple DNS options that people have mentioned. In fact, the closest answer anyone seems to have had was setting the DNS the same as the router's http address. My phone connects to the router with the dns already identical to the http address (192.168.0.1). And like I said, I can access the router's settings page, change whatever I want on the router with my iphone. But can't ever seem to get the internet to work.
Any network gurus have any suggestions?

Answer 1

I have both an iPhone 3G and an iPod Touch. Both have had this problem with 2.0.0, 2.0.1, and 2.0.2. I didn't have the 3G prior to 2.0, but I had the iPod Touch, and the touch connected to my wifi setup fine then.
I experience the problem regardless of whether my router is set to WPA, WEP, or no security. (Router is a Linksys WRT54G.)
Here's a very specific reproduction case. I go to settings, Wi-Fi, and choose my network. After entering the password successfully, I click the blue arrow and see that DHCP has correctly found an IP address for the device. I can even ping to the device from my other computers on the network. Interestingly, the ping times are erratic and tend to be long--up to half a second but as low as 80ms (as opposed to ~1 or 2ms pinging the router itself from a computer). Now I go to Safari on the device and visit any URL--say www.apple.com. I see the blue wifi waves on the status bar. The spinner is spinning. The address bar shows about 5% blue as if the page was beginning to load. But then for about 1 minute the bar doesn't move, and finally I get an error: "Safari could not open the page because the server stopped responding." All applications that use the net behave the same way. I am able to access my router's setup page directly. Interestingly, if I try to access an external site numerically--like http://17.149.160.10 for Apple, the blue bar creeps to about the 10% mark before freezing and progressing no farther.
There's definitely something funny going on with the new software's wireless access. It may have to do with the router, but it doesn't sound specific to the router.