I can not disable the auto-negotiation (eth1) on my centos 6.2 via ethtool or /etc/sysconfig/network-scripts/ifcfg-eth1
the eth1 is a private network on a cheap gigabit-switch (under controll from a serverhoster). sometime the ethernet-card lost the "speed" and "duplex" information and change it to "unknown". i can only fix this with a network-restart (or ifup/ifdown). now i will disable the autonegotiation - but i does not work.
thanks sebastian
On 20 March 2012 14:29, sebastian centos@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
mike
Michael Simpson wrote:
On 20 March 2012 14:29, sebastian centos@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
mark
Am 20.03.2012 16:33, schrieb m.roth@5-cent.us:
Michael Simpson wrote:
On 20 March 2012 14:29, sebastiancentos@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
mark
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.
sebastian
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
On Tue, Mar 20, 2012 at 11:47 AM, sebastian centos@secretusenet.com wrote:
Am 20.03.2012 16:33, schrieb m.roth@5-cent.us:
Michael Simpson wrote:
On 20 March 2012 14:29, sebastiancentos@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
mark
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 useful. I'm hoping to solve the problem with disable the auto-negotiation.
sebastian
As already said, you cannot disable auto-negotiation for gigabit, so you will need to look for other ways to solve the problem.
Disabling auto-negotiation is anachronistic and no one should be doing it anymore. There were reportedly problems with it in the early days, like 15 years ago, but they have all been resolved.
❧ Brian Mathis
sebastian wrote:
Am 20.03.2012 16:33, schrieb m.roth@5-cent.us:
Michael Simpson wrote:
On 20 March 2012 14:29, sebastiancentos@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
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Brian Mathis -
m.roth＠5-cent.us -
Michael Simpson -
sebastian