[CentOS] disable auto-negotiation gigabit ethernet

Tue Mar 20 15:33:58 UTC 2012
m.roth at 5-cent.us <m.roth at 5-cent.us>

Michael Simpson wrote:
> On 20 March 2012 14:29, sebastian <centos at secretusenet.com> wrote:
>> I can not disable the auto-negotiation (eth1) on my centos 6.2 via
>> ethtool or /etc/sysconfig/network-scripts/ifcfg-eth1
> Autonegotiation is mandatory for 1000BASE-T as both sides have to work
> out which pairs they are going to use.
> Check:
> 1)cable
> 2)switchport
> if those are ok then you probably have a driver/NIC problem
Two more things:
   a) make sure the router/switch isn't pegged or being changed to slower
   b) are your cables ok for gigabit. I know this sounds absurd, but I,
        personally, have changed cables, and it made the difference