virsh # net-dumpxml default
<network>
<name>default</name>
<uuid>de718aab-fd71-d359-08b8-ba846473bbb3</uuid>
<forward mode='nat'/>
<bridge name='virbr0' stp='on' delay='0' />
<mac address='52:54:00:DA:8E:DB'/>
<ip address='192.168.122.1' netmask='255.255.0.0'>
<tftp root='/tftpboot' />
<dhcp>
<range start='192.168.122.2' end='192.168.122.200' />
<bootp file='/pxelinux.0' />
</dhcp>
</ip>
</network>
qemu-system-x86_64 -boot c -drive file=/var/lib/libvirt/images/sles11sp2.img,if=virtio -m 1024 -vnc 0.0.0.0:0 -netdev type=tap,script=/usr/bin/qemu-ifup,id=hostnet0 -device virtio-net-pci,id=net0,mac=52:54:00:0b:eb:e4,netdev=hostnet0