Linux - unable to resolve host

[ChroniX]

After installing Red Hat Enterprise Linux, I am unable to connect to the internet. I have installed this OS in the past, about two years ago, and had not one problem connecting to any website. So does anyone have advice that may get me online with Linux? May this be a possible router issue? I have searched google and the only close result to mine I found were people having a problem connecting to the internet with Linux after a reboot, but mine simply wont start period after a fresh install. As always, any advice and/or suggestions are welcome and appreciated.

Added * Should this have been posted in 'Computer Support Issues'?

[Newby]

Err... stupid question, but are you doing DHCP or static IP? And can you talk to your router?

[ChroniX]

Yes, I am using DHCP, and no, I can't contact my router through my Linux box.

[Kp]

Is your network card recognized?  Does it receive an address?  Is the routing table correct?  How did you test whether you can reach the router from the Linux system?