How to change the setting for a network device reported by ethtool, specifically Speed, on VM?

Posted by Ramadheer Singh on Server Fault See other posts from Server Fault or by Ramadheer Singh
Published on 2014-06-05T19:33:33Z Indexed on 2014/06/06 9:28 UTC
Read the original article Hit count: 175

Filed under:

networking

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virtual-machines

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OpenStack

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gigabit-ethernet

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ethtool

This is related to these two questions, although they don't answer my question.

The machines are RHEL6.

1.ethtool not showing all the properties 2.changing network speed to 1000Mb/s

Output on VM:

 [root@foo ~]# ethtool eth0 Settings for eth0:
       Current message level: 0x00000007 (7)
         Link detected: yes

Output on Real Hardware: (interested in Speed)

# ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised auto-negotiation: Yes
        ***Speed: 1000Mb/s***
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: d
        Wake-on: d
        Link detected: yes

if there's anyway I can set this in VM, please suggest.

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