[CentOS] RTL8111/8168B always 100mbps

[m.roth at 5-cent.us]

John Doe wrote:
> 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...

Seriously, on a switch, individual ports can be, and are, configurable.
I've had to call my network people to have it fixed from 100Mb to autoneg
for individual machines.

        mark