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Why does my xbox live IP address always fail???!?

every time i try to connect to xbox live it says my gateway didnt respond or something like that
but i checked my computer (THE ONE WITH THE ROUTER) and i copied the exact details for the IP address, the Subnet Mask, and the default Gateway
and it never works!
somebody help me plzzz!!!!!!!!!!!!!!!!!!!!!!the last number of the ip adress you put in should be 0 if this is so change it to a different number like 9 or something and that could fix it