On one of our development systems the Internet quit working after a power 
failure and a reboot.   We suspect that that a new kernel was downloaded by 
Yum and never took effect till a reboot occurred sometime later.
History:
We know that the realtech driver for chip set RTL 8111/8168B works with SL 
5.4 -> 5.10.  The problem is with SL 6.1 - 6.5.  Same box same hardware.

A long time ago we installed a special kernel from ELRepo.org to fix the 
problem with SL 6.4.

SL 6.4 later was updated to SL 6.5 and still no Ethernet - 

ifconfig shows that it can receive but not transmit as before.

Would it be appropriate to reinstall the 
kernel-lt-3.10.32-1.el6.elrepo.x86_64.rpm     date  28 Feb. 14
to fix the problem.

Second question: How do you turn automatic updates OFF.

Larry Linder