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It is done by libvirt.

Vish

On Jun 5, 2012, at 11:55 PM, William Herry wrote:

> when a instance created, a network interface call vnetX will be created and attach to that instance
> 
> I find related info about this in nova/virt/libvirt/vif.py, ip and tunctl seem to be the tool to create that, 
> but one of our compute node base on centos6.2, iproute is not support tuntap(show error when I run ip tuntap add)
> and uml-utilities(provide tunctl command) is not installed, but vnetX still be created when launch a instance
> 
> my question is, how did vnetX created, doesn't nova code handle this, or this work belong to libvirt
> can I create this kind interface manually and attach to instance, how to do this
> 
> Thanks
> 
> -- 
> 
> 
> 
> William Herry
> ====================
> WilliamHerryChina at Gmail.com
> 
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