sebastian wrote: > Am 20.03.2012 16:33, schrieb 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 > Thanks, but is a remote-server, the server is in another datacenter. I > can not change or check the cables/switch - and the stuff in the > datacenter is not very usefull. I'm hoping to solve the problem with > disable the auto-negotiation. Hey - I was assuming it wasn't under your control, any more than mine, here at work, are under mine. When I have this problem, I file a ticket, and eventually get to talk to the admins who *do* have control over that. And yes, too many times, I get a "oh, it is pegged, I have no idea how that happened...." from them before they fix it. mark