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  1. ZABBIX BUGS AND ISSUES
  2. ZBX-21697

Linux reports wrong speed for vnet devices (KVM guests)

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    • Icon: Incident report Incident report
    • Resolution: Unresolved
    • Icon: Major Major
    • None
    • 6.2.3
    • Templates (T)
    • None
    • RHEL 7,8,9

      Steps to reproduce:

      1. Use the latest "Linux by zabbix agent (active)" template
      2. Have kvm based vms running on the host
      3. Have vnet interfaces discovered
      4. Verify the link speed

      Result:

      Kernel always reports link speed of 10mbit for any vnet* devices related to kvm virtual machines, so the speed related trigger is fired.

       

      Someone reported this on the forum:

      https://www.zabbix.com/forum/zabbix-help/359479-centos-kvm-incorrect-speed-for-vnet-interfaces

       

      See:

      https://access.redhat.com/solutions/65061

      Quote: "vnet interfaces are tap devices. The 10Mbps is just a cosmetic figure in a tap device's virtual firmware. This speed has no bearing on the speed of a guest's virtual device whatsoever."

      Expected:
      vnet devices should likely be excluded in the default regex for {$NET.IF.IFNAME.NOT_MATCHES}

            drasikhov Denis Rasikhov
            che666 Rudolf Kastl
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            2 Vote for this issue
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