works

example_box/metadata.json

@@ -1,5 +1,5 @@
 {
   "provider"     : "libvirt",
   "format"       : "qcow2",
-  "virtual_size" : 40
+  "virtual_size" : 16 
 }

lib/vagrant-libvirt/action/prepare_nfs_settings.rb

@@ -39,18 +39,16 @@ module VagrantPlugins
         #
         # @param [Machine] machine
         # @return [String]
-        def read_host_ip(ip)
-          UDPSocket.open do |s|
-            @logger.info("!!!! ALL IPs #{ip} #{ip.kind_of?(Array)}" )
-            if ip.kind_of?(Array)
-              s.connect(ip[0], 1)
-            else
-              s.connect(ip, 1)
-            end  
-          s.addr.last
-          end
+	def read_host_ip(ip)
+      UDPSocket.open do |s|
+        if(ip.kind_of?(Array))
+            s.connect(ip.last, 1)
+        else
+            s.connect(ip, 1)
         end
-
+        s.addr.last
+      end
+    end
         # Returns the IP address of the guest
         #
         # @param [Machine] machine