On 02/04/2016 02:47 PM, Niccolò Belli wrote: If you want to create a completely separate subnet contained within the host, and have all traffic to/from the outside routed via the host's IP stack, define a libvirt network, setup the IP subnet you want for the network, then in the final screen select "Forwarding to physical network", Destination: "Any physical device", Mode: "Routed". Once you've started this network, it will appear in the list of possible connections for a guest's network interfaces. Note that you will need to teach the rest of the network to forward packets for this new subnet to the host's physical ethernet IP (but if you're specifically asking for a routed network, then you likely already know this (either that or I've misunderstood your question) :-) You can see more info about the possible types of networks here: http://www.libvirt.org/formatnetwork.html I've set Reply-To: in this message to libvirt-users(a)redhat.com. It really is a more appropriate place for these questions, as the netcf mailing list deals specifically with the netcf library, which isn't involved in any of the things we're discussing here.