Networking :: Ubuntu Server Can't Access Internet ?

I'm setting up an old box as a dedicated file-sharing server on the LAN as well as an internet web server for my personal web site but I have no network connection. My computer is connected to a router which is connected to my DSL modem. The router has the Ubuntu box's MAC address as well as a Win7 box, which connects to the internet fine.

Here is what I've tried:

1. Check routing table

Code:

2. Try to add a default gateway to the internet on eth2, this happens:

Code:

3. I edited resolv.conf, which was empty, adding:

4. I edited /etc/network/interfaces as follows:

Code:

Then I type the following:

Code:

And it keeps doing this endlessly because it's not finding the DHCP server, presumably...? This didn't solve the problem and so I attempted another configuration:

Code:

Still, not internet connection and no ability to apt-get anything (says packages not found)

So, this didn't work either. What I've tried should work, especially the route command. Now why won't it work?