Bug 486575

Summary: Ignores 'target dev=...' attribute in network devices
Product: [Fedora] Fedora Reporter: Enrico Scholz <rh-bugzilla>
Component: libvirtAssignee: Daniel Veillard <veillard>
Status: CLOSED UPSTREAM QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: low    
Version: 10CC: berrange, clalance, crobinso, markmc, veillard, virt-maint
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OS: Linux   
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Last Closed: 2009-12-02 08:00:37 EST Type: ---
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Description Enrico Scholz 2009-02-20 07:28:35 EST
Description of problem:

libvirt seems to ignore the name given in <target dev='...'> statements. E.g. when following documentation and adding a

    <interface type='bridge'>
      <mac address='54:52:00:0f:f8:64'/>
      <target dev='vnet101'/>
      <source bridge='eth0'/>
      <model type='virtio'/>
    </interface>

network device to a qemu-kvm domain, the resulting interface is 'vnet0' (or the first available one), but not 'vnet101' as requested.

Predictable interface names are essential as they are used in firewall rules.


Version-Release number of selected component (if applicable):

libvirt-0.5.1-2.fc10.x86_64
Comment 1 Mark McLoughlin 2009-02-20 12:49:25 EST
This is intentional, see:

  http://www.redhat.com/archives/libvir-list/2007-December/msg00040.html

  > Hang about though, don't we sometimes want to explicitly set the name of 
  > some interfaces to vnetXXX?

  No, if you want to manually set interface names, you have to use something
  other than a 'vnet' prefix. 'vnet' is the prefix for auto-generated names
  in same way as 'vif' is the prefix for Xen auto-generated names.
Comment 2 Daniel Berrange 2009-02-20 12:59:28 EST
As Mark says this is intentionale, but we should probably update the domain XML documentation to mention the reserved prefixes.
Comment 3 Bug Zapper 2009-11-18 06:10:10 EST
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Comment 4 Cole Robinson 2009-12-02 08:00:37 EST
As per comment #2, there are now explicit docs for this upstream:

http://libvirt.org/formatdomain.html#elementsNICSTargetOverride

So closing this bug as UPSTREAM.