diff -r 37ebd7eae0be tools/python/xen/xend/image.py
--- a/tools/python/xen/xend/image.py	Tue Apr 15 17:23:39 2008 +0800
+++ b/tools/python/xen/xend/image.py	Tue Aug 05 16:04:08 2008 +0800
@@ -777,6 +777,10 @@ class HVMImageHandler(ImageHandler):
             ret.append("tap,vlan=%d,ifname=tap%d.%d,bridge=%s" %
                        (nics, self.vm.getDomid(), nics-1, bridge))
 
+        if nics == 0:
+            ret.append("-net")
+            ret.append("none")
+
         return ret
 
     def getDeviceModelArgs(self, restore = False):