virtio network driver info


New Member
Feb 24, 2022
Hi All,

How can I get valid interface details from a paravirtualized interface within a VM? ethtool doesn't show anything useful with the para driver...

ethtool  ens19
        Settings for ens19:
        Supported ports: [  ]
        Supported link modes:   Not reported
        Supported pause frame use: No
        Supports auto-negotiation: No
        Supported FEC modes: Not reported
        Advertised link modes:  Not reported
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: Unknown!
        Duplex: Unknown! (255)
        Auto-negotiation: off
        Port: Other
        PHYAD: 0
        Transceiver: internal
        Link detected: yes

But with a real driver, I get details on speed, duplex, etc...
ethtool  enp139s0f1
        Settings for enp139s0f1:
        Supported ports: [ TP ]
        Supported link modes:   100baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  100baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Speed: 10000Mb/s
        Duplex: Full
        Auto-negotiation: on
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        MDI-X: Unknown
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

Thank you for any clarification you can offer.
Jan 16, 2018
This would be interesting for me too.

We have several applications which would need the link speed inside the VM:

-> Samba ->it would use multiple Streams only with link speeds of 10Gbit/s and up, and the number of streams is dependent of the Link speed

Same for Lustre and Irods.

As it is of course not very useful to get the link speed from a bridged interface, it would be helpful to have parameters in the VM Setup (like the MAC Adress) which would tell the VM a link speed. Would that be possible?


Proxmox Staff Member
Staff member
Jul 28, 2015
South Tyrol/Italy
IMO software that is just depending on such (fake/useless) information without allowing to override it manually is rather broken.

But still, virtualization is also about allowing such broken software to exist and work, so I'm fine with adding this as advanced option for virtual VM NICs. It'd be great if one of you could open an enhancement request for this over at to keep track of it.


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