Re: macvtap not working on kvm

xhu <xhu@xxxxxxxxxx> · Tue, 13 Dec 2011 17:30:37 +0800



    On 12/13/2011 12:59 PM, Amit Tewari wrote:
    
      
        Hi all,
         
        My test
              environment
        Host
              os=rhel6.1
        Guest os =
              rhel6.1
        Libvirt=0.9.8
        Kvm
              hypervisor
         
        I have made
              this entry in guest xml file
         
        <interface
              type='direct'>
             
              <source dev='eth0'
              mode='bridge'/>
             
              <model type='virtio'/>
             
              <address type='pci'
              domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
           
              </interface>
         
        Now when I
              start the guest 
        #virsh start guest
         
        Following
              macvtap0 is created on host and is shown below
        #ip link show macvtap0
        51:
              macvtap0@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP>
              mtu 1500 qdisc mq state UNKNOWN qlen 500
           
              link/ether 52:54:00:55:AE:B5brd
              ff:ff:ff:ff:ff:ff
         
        but when the
              guest is up and I try to perform
         
        # ifup eth0
         
        It gives
              following message
        “Bringing up
              interface eth0:  Device eth0 does
              not seem to be present, delaying initialization.
        [FAILED]”
      
    
    The interface name may change to ethN(N may be 1 or 2 ...) due to
    the change of guest interface mac address.

    You can log in guest and use command: "ip  link show" to get the
    value of N.

    Then create ifcfg-ethN for it and use "ifup ethN" to start it in
    guest.

    
        Guest eth
              interface does not create. What is the problem?
         
        When I
              checked dmesg
              on host it gives following message—“macvatp0: ipv6 routers
              not
              present”
         
        Please let me
              know how macvtap work on kvm.
         
      
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