Re: macvtap nt working on kvm

Stefan Berger <stefanb@xxxxxxxxxxxxxxxxxx> · Wed, 14 Dec 2011 14:26:39 -0500



    On 12/14/2011 07:40 AM, Amit Tewari wrote:
    
      
        Hi
              all,
         
        My
              test environment
        Host
              os=rhel6.1
        Guest
              os = rhel6.1
        Libvirt=0.8.7
        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
         
        eth0 has
                same mac address as that of macvatap0 that is
                 52:54:00:55:AE:B5
         
        due to
                this guest is not able to get dhcp address nor static ip
                address is working. 
         
        Please
              let me know how macvtap work on
              kvm.
      
    
    I have tried your setup on my machine with the following host
    configuration:

    
    # brctl show

      bridge name    bridge id        STP enabled    interfaces

      br0        8000.001a64d00016    no        eth0

      virbr0        8000.000000000000    yes        

    
    If I use the configuration as you have shown it doesn't work for me,
    either. However, if I use

    
          <source dev='br0' mode='bridge'/>

    
    then it works as expected. Do you happen to have a similar
    configuration on the host with the interface the macvtap device
    wants to use as 'source' being bridged? 

    
       Stefan

    
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