thanks.
i have a  try inside vmware'VMs, mii-tool  and ethtool can give more 
infomations about ethernet.
i think it is xenserver's defect.meanwhile you can not specify  a certain kind 
of ethernet when create VMs.


At 2012-08-23 15:47:14,"Wido den Hollander" <w...@widodh.nl> wrote:
>Hi,
>
>On 08/23/2012 09:29 AM, coudstacks wrote:
>> always  error when launch mii-tool command
>>
>> SIOCGMIIPHY on 'eth0' failed: Operation not supported.
>>
>> does it  matter?
>>
>
>No, you are working with a virtual network interface inside the Virtual 
>Machine, that doesn't support everything a physical NIC does.
>
>You could try ethtool:
>
>$ ethtool eth0
>
>Wido
>

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