Network problems: Connect to router

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http://forums.fedoraforum.org – Hi All, I've been trying to work through problems connecting to the network for one specific Fedora box. The cable modem works fine when I use a different machine. But if I connect the Fedora machine to the cable modem, I can't start networking. I just tried something different. I connected the cable model to a router, and then connected the Fedora machine. If I do this, I can actually log into the router from the fedora machine. so at least the networking goes that far. But I can not get anywhere on the internet. Maybe the DNS is bad, I don't know. Any ideas how to figure thi (HowTos)