diff --git a/install/variables/net.py b/install/variables/net.py
index 01b0032..a07cfe3 100644
--- a/install/variables/net.py
+++ b/install/variables/net.py
@@ -34,6 +34,7 @@ from calculate.lib.utils import ip
 from calculate.lib.utils.portage import isPkgInstalled
 from operator import itemgetter
 from itertools import *
+from functools import partial
 import hashlib
 from calculate.install.distr import DistributiveError
 
@@ -92,18 +93,24 @@ class VariableOsInstallNetInterfacesOrig(NetHelper,ReadonlyVariable):
     """
     type = "list"
 
+    def is_classic_interface_name(self):
+        hashsum = lambda x: hashlib.md5(readFile(x)).digest()
+        chroot_path = self.Get('cl_chroot_path')
+        etc_path_join = partial(path.join,
+                                chroot_path, 'etc/udev/rules.d')
+        lib_path_join = partial(path.join,
+                                chroot_path, 'lib/udev/rules.d')
+        udev_files = ('70-persistent-net.rules',
+                      '80-net-name-slot.rules',
+                      '80-net-setup-link.rules')
+        for etc_file, lib_file in  izip(map(etc_path_join,udev_files),
+                                        map(lib_path_join,udev_files)):
+            if path.exists(etc_file) and hashsum(etc_file) != hashsum(lib_file):
+                return True
+        return False
+
     def get(self):
-        chrootPath = self.Get('cl_chroot_path')
-        pathOldUdevNet = path.join(chrootPath,
-            'etc/udev/rules.d/70-persistent-net.rules')
-        pathNewUdevNet = path.join(chrootPath,
-            'etc/udev/rules.d/80-net-name-slot.rules')
-        pathOrigUdevNet = path.join(chrootPath,
-            'lib/udev/rules.d/80-net-name-slot.rules')
-        if path.exists(pathOldUdevNet) or \
-            (path.exists(pathNewUdevNet) and 
-            hashlib.md5(readFile(pathNewUdevNet)).digest() != \
-            hashlib.md5(readFile(pathOrigUdevNet)).digest()):
+        if self.is_classic_interface_name():
             return self.Get('os_install_net_interfaces')
         def getOrig(x):
             try: