[Libvir] vif-nat network setup

Hello, is it possible to setup a NAT-ed network with libvir? My dom0 is configured so that it does a router for domUs and it also does NAT for domUs. I can set this up manually but now I would like to install some other domUs automatically with virt-install. I see that it uses libvir to create new domain from the XML description so it should be easy to add some option that would configure the XML, but I cannot find if the XML supports NAT setup. If I try 'virsh dumpxml' when the domU runs I get this: Unimplemented block at xend_internal.c:1667 <domain type='xen' id='1'> <name>ce</name> <uuid>400be3cf7cedc1d388de8796a85daff1</uuid> <os> <type>linux</type> <kernel>/boot/vmlinuz-2.6.18-prep</kernel> <initrd>/boot/initrd-2.6.18-prep.img</initrd> <root>/dev/sda1</root> <cmdline>fastboot ro root=/dev/sda1</cmdline> </os> <memory>131072</memory> <vcpu>1</vcpu> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <!-- Failed to parse vif: (device (vif (backend 0) (script vif-nat) (ip 10.0.9.1/24) (mac 00:16:3E:47:A1:09) (vifname cevif))) --> <console tty='/dev/pts/2'/> </devices> </domain> Thanks for any answer. -- Tomas Kouba