This talks about creating private and public bridges:
	https://linuxhint.com/creating_centos_8_kvm_networked_bridge_interface/

Redhat doc about libvirt networking:
	https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/virtualization_administration_guide/sect-network_address_translation-libvirt

Useful for starting NAT:
	https://wiki.libvirt.org/page/Networking
	sudo virsh net-start default

Make the virtual-DHCP always give the same IP address:
	virsh net-update default add ip-dhcp-host \
          "<host mac='52:54:00:00:00:01' \
           name='bob' ip='192.168.122.45' />" \
           --live --config