Trouble with iMac connecting directly to the modem

I have an AirPort Extreme, provision of a wifi network in my house. It is connected to a modem Concast Cisco DPC3941T model.

I planned to connect my iMac (retina 5 k, 27 "running 10.11.3) directly to the modem and not use wifi to connect to the Internet.  I plugged a bolt of lightning for the Ethernet card in and ran a cord to the Cisco modem, but the iMac doesn't recognize this connection.

Network preferences says "Thunderbolt Ethernet has an assigned IP address and won't be able to connect to the Internet."  Sorry, don't know what that means.

The reason behind the try it is that my wifi signal is de-energized intermittently and I can't understand why. So I thought that if I plugged the iMac directly I could avoid the abandonment wifi issues.

Thanks in advance for your suggestions.

You have removed the Airport Extreme?

If you connect the computer directly into the modem, the ethernet indicator lights on the router. It is essential for the ethernet work.

Using an ethernet cable, you bought? If it's super long they can give trouble... a short cable should be fine.

If you are not sure the little light on the AE plug the computer by ethernet in the extreme with a cord short... lights... If so, you can plug the cord of the cisco to another port ethernet on EI and make sure it works too.

Network preferences says "Thunderbolt Ethernet has an assigned IP address and won't be able to connect to the Internet."  Sorry, don't know what that means.

Ethernet is not connected or DHCP does not work. If the modem has been bridged it won't work, unless you turn off the modem for about 20 min. Then launch new follow-up to the computer.

Tags: Wireless

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