On Thu, 13 Mar 2014, Larry Linder wrote:

> 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
>

You can boot with the prior kernel to verify that it is a newer kernel 
that caused the net to not work.  It should still be on your system.

-Connie Sieh