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Libvirt networking

default net

 virsh net-start default
 virsh net-autostart default

which vnetX belongs to which guest

$ virsh dumpxml starfish|grep vnet
      <target dev='vnet18'/>
      <target dev='vnet19'/>

VNET=vnet13
for vm in $(virsh list | grep running | awk '{print $2}'); do
  virsh dumpxml $vm|grep -q "$VNET" && echo $vm
done