On Friday 11 Nov 2011 21:12:29 Michael Mol wrote:
> On Fri, Nov 11, 2011 at 4:08 PM, Alan McKinnon <alan.mckinnon@gmail.com> 
wrote:
> > On Fri, 11 Nov 2011 15:28:26 -0500
> > 
> > Allan Gottlieb <gottlieb@nyu.edu> wrote:
> >> 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
> >> 
> >> I am hoping it is some wrong setting in the bios, but the only one I
> >> see says the ethernet can be   disabled   enabled   enabled (with pxe)
> >> 
> >> I tried both of the enabled variants with the same outcome.
> >> 
> >> I don't think I changed the kernel during that time, but I did try two
> >> older kernels; again with no change.  I believe I have the correct
> >> driver built into the kernel
> >> 
> >>   ajglap gottlieb # lspci -v
> >> 
> >>   [snip]
> >> 
> >>   00:19.0 Ethernet controller: Intel Corporation 82577LM Gigabit
> >> Network Connection (rev 05) Subsystem: Dell Device 040b
> >>           Flags: bus master, fast devsel, latency 0, IRQ 42
> >>           Memory at e9600000 (32-bit, non-prefetchable) [size=128K]
> >>           Memory at e9680000 (32-bit, non-prefetchable) [size=4K]
> >>           I/O ports at 8040 [size=32]
> >>           Capabilities: [c8] Power Management version 2
> >>           Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
> >>           Capabilities: [e0] PCI Advanced Features
> >>           Kernel driver in use: e1000e
> > 
> > Seeing as it's gentoo, my first guess is that the new motherboard
> > doesn't have the same hardware as the old one - Dell can easily fit any
> > wireless card with the same specs - and that you don't have the correct
> > module loaded.
> > 
> > In the BIOS the option you want is plain "enabled", if you need pxe you
> > will certainly know all about that already.
> > 
> > Any clues in dmesg about the hardware?
> 
> On that note, find the udev rule for persistent networking and wipe it.

+1

rm /etc/udev/rules.d/70-persistent-net.rules

then reboot.
-- 
Regards,
Mick