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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  1. Anonymous
    January 10, 2012 at 9:28 am

    vPerhaps you can control with the following
    Wicd 
    http://wicd.sourceforge.net/
    or
    ifdown ethX,ifup ethX (X is the interface #)

    Ubuntu Networking Configuration Using Command Line
    http://www.ubuntugeek.com/ubuntu-networking-configuration-using-command-line.html

  2. Mike
    January 10, 2012 at 7:08 am

    Have you tried the modem and port using a different computer yet? During a thunderstorm it is (more) likely that the modem got damaged via an overload coming from the WAN side.

    Unless you setup a static IP the ethernet interface will reset by just doing a reboot. As for the second port it is possible that it's using a different chipset which wasn't identified during the Ubuntu installation

    I suggest to open up the terminal and run "ifconfig -a" to see if there are two interfaces identified (eth0, eth1).