Am 11.11.2011 21:28, schrieb Allan Gottlieb:
> My dell laptop E6510 had its motherboard replaced (as it turned out, for
> no good reason) and now the wired ethernet fails.
> 
>     ajglap gottlieb # /etc/init.d/net.eth0 restart
>      * Bringing up interface eth0
>      *   ERROR: interface eth0 does not exist
>      *   Ensure that you have loaded the correct kernel module for your hardware
>      * ERROR: net.eth0 failed to start
> 
[...]

Try `/sbin/ifconfig -a`. If you are lucky, it will show you an eth1
interface or something alike. The issue is that udev keeps track of
network interfaces. If it finds a new one, it asigns it a new number
instead of reusing the old one. You can change this, but to get
everything running fast, just copy your config from eth0 to eth1, create
a symlink between /etc/init.d/net.lo and /etc/init.d/net.eth1 and start
that one.

Hope this helps,
Florian Philipp