disable auto-negotiation gigabit ethernet

[sebastian <centos@xxxxxxxxxxxxxxxx>]

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
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