For reference, this is Microsoft's support page on the subject: Network ports used by Xbox LIVE
However, ChaseRankin's question is the correct first one to ask, what type of router do you have? The next question would be whether there's a specific error message you're trying to fix, as that will determine the solution.
We don't officially provide detailed support for consoles or wireless, but we should generally be able to point you in the right direction. 