[oclug] Eth0 dead after Ubuntu update
oclug at kernelpanic.ca
Fri Oct 1 17:19:37 EDT 2010
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
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
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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