Ethtool

bruce.labitt at autoliv.com bruce.labitt at autoliv.com
Wed Oct 22 10:31:54 EDT 2008


CentOS5.2, ethtool 5, Intel PCI 1000Mbit ethernet card - running e1000 
driver.

The connection from my pc to the local gbit switch is autonegotiating to 
10Mbit :(
I tried using ethtool to change the connection speed and it seems either I 
am not doing it right (most likely), or something is wrong.

If I attach the NIC directly to my remote server it negotiates to 
1000Mbit, so I think the NIC is ok.  If I plug the remote server directly 
to the switch, it negotiates to 1000Mbit, so I would think the switch is 
ok. 

So how does one set the speed in ethtool?

# ethtool -s eth0 speed 1000 duplex full   ?

How come this does not work?  Wrong syntax?  Something else?  I've tried a 
bunch of cables, including ones that did support 1000Mbit.

-Bruce

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