[CentOS] RTL8111/8168B always 100mbps

From: "m.roth at 5-cent.us" <m.roth at 5-cent.us>

> I was working on a similar problem (turned out to be our network switch),
> but *did* find that order of the ethtool command is significant: you
> *MUST* have autoneg off as the first parameter; that is, try
> # ethtool -s eth0  autoneg off speed 1000 duplex full advertise 0x020

Tried that but I still get autoneg on... and 100Mbps.
In fact, the only way to have autoneg really off seems to not include "speed 1000"...
But if I do not put "speed 1000", nothing changes.
And as soon as I put "speed 1000", autoneg is back on... even with "autoneg off" in front...

JD