simulate "network cable unplugged"

[David Mansfield <libvirt@xxxxxxxxxxxxx>]

Hi All,

Using the virt-manager/libvirtd/qemu-kvm stack (centos 6), is it 
possible to leave a NIC "installed" but cause it to simulate that the 
network cable is unplugged?  Preferably this could be "hot" 
plugged/unplugged but otherwise doing it cold.

Guest os is also centos 6, in case it matters (shouldn't).

Any pointers?

Thanks,
David Mansfield
Cobite, INC.