"Easiest way to check is boot the live cd and do lspci -K. This will
list detected hardware on the PCI bus and if applicable the drivers.
Note the RTL8169 name, probably 'r8169'."
1) the result of #lspci K was:
02:00.0 Ethernet Controller: Intel Corporation 82574L Gigabit Network connection
....................................................................................................................
kernel modules:e1000e
2)after that I did a test with: #modprobe e1000e that returned:
modprobe:ERROR: could not insert 'e1000e' unknown symbol in mocule, or unknown parameter (see dmesg)
I still have to run 'make menuconfig' as I was told to do but I do not understand this modprobe ERROR as it is not he first time I do #modprobe and this error message comes as result.
3)I must explain that I have changed the ethernet controller just to check it would be recognized but it wasn't either, like the other ethernet controller