Need help with connection to Xbox LIVE

[Roshan]

So I have this router D-Link DIR-300.It's already configured,it's wireless and the internet works perfectly on my Laptop,but it doesn't work with my Xbox 360.The internet without the router,directly into my fiber cable thing works perfectly,but with the router it doesn't.I plug the ethernet cable on the back of the Router and when I try to connect I get "Can't Connect to Xbox Live".
After some reading I forwarded some ports : 3074,1863,88,80,53,but it still doesn't work.Any suggestions ?

[Cheeese]

http://support.xbox.com/en-gb/pages/xbox-live/troubleshoot/connection-issues/cant-connect-to-xbox-live-wizard.aspx

If not call your isp or microsoft

[Boylin]

Make sure UPnP is enabled on the router and that it's set to automatically assign IP addresses to devices (unless you specifically want static ones). I'm not familiar with your router though so can't be much more help than that, sorry.