[ubuntu] wireless non connection

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http://ubuntuforums.org – Hi! I've had this problem for a long time now. Maybe someone here can help me solve it. My computer sees the wireless network at home, ChinaNet-zbgJ. The dsl router is brand new, they just changed things to make it faster. I have the password, it is written on the router. Ubuntu says I am connected, but I could never, cannot now, access the internet via wireless at home. There is no hardware fault. My son uses Win, and connects via wireless. I can connect at work to the wireless network using this computer and Ubuntu. Some setting is stopping the connection. Does anyone here have any idea (Hardware)