[CentOS] ethtool

[Stephen Harris]

On Tue, Sep 28, 2010 at 03:51:17PM -0400, m.roth at 5-cent.us wrote:
> We've just moved one a new server from our sever room, where I built it,
> to the datacenter. We want to force autoneg off, and tell it gigabit and
> full duplex. Using ethtool, I get no errors setting the speed or duplex.

Note that the gigabit over copper standard _requires_ autoneg on.  If you
do manage to turn it off then you might break things unexpectedly.

http://en.wikipedia.org/wiki/Autonegotiation

   In 1999, the negotiation protocol was significantly extended by
   IEEE 802.3ab, which specified the protocol for gigabit Ethernet,
   making autonegotiation mandatory for 1000BASE-T gigabit Ethernet over
   copper. Specifically Section 28D.5 Extensions required for Clause40
   (1000BASE-T)

-- 

rgds
Stephen