MBP won't connect to network.

I have a '09 MBP, Cox Internet, and a Belkin Router. My MBP will connect to the router through WiFi and through LAN but for some reason won't actually get internet. The router works through the home computer and laptop (both Windows). I've read that there are sometimes problems with the Belkin router and Macs but I've tried every setting on there and can't figure it out.
I want to at least pinpoint where the problem lies. We have a fairly old modem so I'm not sure if that is the issue. I've also tried plugging in the computer directly into the modem  which results in the same thing, which is odd because I used to have a Buffalo router and everything worked fine.
I used to be able to connect on my MBP by VPN'ing into a different network, so I guess there is some DNS issues on my network, but not I can't VPN either.
Any ideas?

DNS, first thing to check for the network. Use GoogleDNS as a test: 8.8.8.8

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