[CentOS] RTL8111/8168B always 100mbps

From: Les Mikesell <lesmikesell at gmail.com>

> Both sides have to negotiate.  The usual lingering problem is that
> someone configured the switch not to.


All other Windows/linux PCs do work fine at 1000Mbps on the same switch...
The other PCs using this Realtek too are Windows.
I will test another cable from another wall plug just in case...

JD