iMac fails to connect to AT&T U-verse via ethernet
I'm not a noob when it comes to my mac, but I don't know much about networking. This problem has me really stumped:
For months, my iMac was connected to my U-verse router via ethernet, by way of my time capsule as a router. Connecting to the internet via time capsule airport works fine. No problems there.
Now, starting about a month ago, my iMac won't connect to the network. When I run network diagnostics, "Ethernet" is green "Network Settings" is Yellow "ISP" is green everything else is red.
In my Network control panel, under ethernet, my status is connected. It says:
"Ethernet has a self-assigned IP address and will not be able to connect to the Internet."
Configure IPv4 is set to "Using DHCP."
Things I've tried are:
-Restarting my computer and both routers.
-Creating a new network location under prefs and starting from scratch.
-Setting my time capsule to "bridge mode."
My setup again is:
Mac OSX 10.6.8
ethernet to a time capsule
timecapsule ethernet to U-verse router
ethernet connection is down
airport works fine
Thanks for any help you can provide!