The alx driver which supports Atheros AR8162/AR8162
can not be build on Centos6.x.
The driver has not yet reached the main stream and package released in
http://www.linuxfoundation.org/collaborate/workgroups/networking/alx does not compile for Centos.
To solve this tedious problem you need to get the original Atheros driver (from Atheros), but after they were bought by Qualcomm this can not be …