Re: Eth0 dead after Ubuntu update

  Steve,

Thanks for the advice. I got the "eth0: no link" message when I ran 
mii-tool. When I crawled under the desk to get at the jack, I found that 
neither of the Ethernet status lights on the jack were lit. I tried a 
second cable that I know works, but they still don't light up. I'm 
guessing that I'm in need of a gigabit ethernet adaptor at this point?

On 01/10/2010 5:19 PM, Stephen Gregory wrote:
> On Thu, Sep 30, 2010 at 10:35:33PM -0400, Aaron Wilcox wrote:
>>> eth0      Link encap:Ethernet  HWaddr 00:1f:d0:af:30:27
>>>            UP BROADCAST MULTICAST  MTU:1500  Metric:1
> The UP keyword means that the software side of the the ethernet device
> is on and ready to accept packets. To see the hardware side use the mii-tool:
>
> $ sudo mii-tool eth0
>
> The output should be something like:
>      eth0: negotiated 100baseTx-FD, link ok
> or
>      eth0: no link
> If you get the second message then there is something wrong with the
> device. The cable could be loose.
>
> For better debug information have a look at the output of
> $ dmesg
> with is also in /var/log/kern.log
>
> If the link is ok then network-manager may be failing. you could try
> running dhcp manually:
>
> $ sudo dhclient eth0
>
>>> Sep 30 22:04:19 thoth NetworkManager:<info>   (eth0): bringing up device.
>>> Sep 30 22:04:19 thoth NetworkManager:<info>   (eth0): preparing device.
>>> Sep 30 22:04:19 thoth NetworkManager:<info>   (eth0): deactivating device (reason: 2).
> I would love to know what "reason 2" is.
>
>
>

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