How can I reset Ubuntu network settings?

Oweson Flynn January 10, 2012
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I am running Ubuntu 11.10. We had a severe thunderstorm last night, and the Ethernet (ETH0) port has stopped working. The LED is red, and the light on the modem doesn’t come on.

The ASUS motherboard has a 2nd Ethernet port. When I plug the cable in, the LED goes yellow, and the modem shows a the green LED. But I can’t seem to get connected.

When I ping the modem, I get a ‘Network unreachable’. When I look at network settings, it says the cables are unplugged for both ports.

How can I get Ubuntu run a wizard to recognise & setup the second Ethernet port?

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