Internet is not working on iPod touch.

My iPod touch is able to connect to a local wireless network, but when I try to open up safari, mail, or other app, it says that it is not connected to the Internet. I know that it is not a problem who the cable because other devices (iPhones, laptops, androids, etc) are working. I think that my iPod touch is not compatible with the wireless Internet router, but somehow I think that incompatibility with a router is impossible. Also, the same kind of router is used somewhere else that I use often works with my iPod.Here's some more info:

Type of Internet: cable, wifi

Cable modem: motorola Surf board cable modem

Wireless router: cisco linksys broadband wireless router

iPod model: 2nd generation iPod touch, iOS 4.2.1

iPod has been recently restored, and I ready restarted the modem, the wireless router, and my iPod.

Please help.