[ubuntu-uk] Ethernet not working after board replacement

[Simon Greenwood]

On 26 June 2012 09:20, James Morrissey <morrissey.james1 at gmail.com> wrote:

> Hi,
>
> I've just had some repairs done on my faulty Thinkpad x121e. From the
> report i got it seems that lenovo replaced the board, the keyboard the
> palmrest and updated the BIOS.
>
> Now however i seem to have a problem with the wired network (ethernet).
>
> Since the board has changed i think that i might be experiencing the
> problems mentioned here:
>
> http://www.linuxquestions.org/questions/linux-newbie-8/ubuntu-wired-network-not-working-after-motherboard-replacement-909481/
>
> In particular:
> "The motherboard will have had onboard Ethernet so the MAC address
> will have changed for the interface. make sure the config is not
> restricted by MAC also check as udev might have kept the old NIC as
> eth0 and the new one is eth1"
>
> I was wondering if anyone here could give me some instructions on how
> to check for restrictions by MAC and how to check udev.
>
>
There are more fundamental things you can check: do the ethernet port LEDs
light at the computer and switch/modem ends? What happens if you boot from
a live CD/USB?

The MAC address of your machine will have changed, and you can see what it
is by opening a terminal and typing 'ifconfig eth0'. Your MAC address is
the HWaddr field on the first line.

Udev rules are in /etc/udev/rules.d. On my desktop there's a ruleset
called 70-persistent-net.rules which does have your MAC address in it
although I would have thought that would have been updated by the OS if it
detected a change. As Alan says, if it's different to ifconfig HWaddr,
delete it and it should be rebuilt.

s/
-- 
Twitter: @sfgreenwood
"TBA are particularly glib"
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