diff --git a/tempest/common/debug.py b/tempest/common/debug.py
index 6a496c2..228be7a 100644
--- a/tempest/common/debug.py
+++ b/tempest/common/debug.py
@@ -20,7 +20,7 @@
 CONF = config.CONF
 LOG = logging.getLogger(__name__)
 
-tables = ['filter', 'nat', 'mangle']
+TABLES = ['filter', 'nat', 'mangle']
 
 
 def log_ip_ns():
@@ -28,14 +28,14 @@
         return
     LOG.info("Host Addr:\n" + commands.ip_addr_raw())
     LOG.info("Host Route:\n" + commands.ip_route_raw())
-    for table in ['filter', 'nat', 'mangle']:
+    for table in TABLES:
         LOG.info('Host %s table:\n%s', table, commands.iptables_raw(table))
     ns_list = commands.ip_ns_list()
     LOG.info("Host ns list" + str(ns_list))
     for ns in ns_list:
         LOG.info("ns(%s) Addr:\n%s", ns, commands.ip_ns_addr(ns))
         LOG.info("ns(%s) Route:\n%s", ns, commands.ip_ns_route(ns))
-        for table in ['filter', 'nat', 'mangle']:
+        for table in TABLES:
             LOG.info('ns(%s) table(%s):\n%s', ns, table,
                      commands.iptables_ns(ns, table))
 
diff --git a/tempest/tests/common/test_debug.py b/tempest/tests/common/test_debug.py
index cd9936c..8a880f2 100644
--- a/tempest/tests/common/test_debug.py
+++ b/tempest/tests/common/test_debug.py
@@ -53,15 +53,14 @@
         self.useFixture(mockpatch.PatchObject(test.CONF.debug,
                                               'enable', True))
 
-        tables = ['filter', 'nat', 'mangle']
         self.ip_ns_list_mock.return_value = [1, 2]
 
         debug.log_ip_ns()
         self.ip_addr_raw_mock.assert_called_with()
         self.assertTrue(self.log_mock.info.called)
         self.ip_route_raw_mock.assert_called_with()
-        self.assertEqual(len(tables), self.iptables_raw_mock.call_count)
-        for table in tables:
+        self.assertEqual(len(debug.TABLES), self.iptables_raw_mock.call_count)
+        for table in debug.TABLES:
             self.assertIn(mock.call(table),
                           self.iptables_raw_mock.call_args_list)
 
@@ -76,10 +75,11 @@
             self.assertIn(mock.call(ns),
                           self.ip_ns_route_mock.call_args_list)
 
-        self.assertEqual(len(tables) * len(self.ip_ns_list_mock.return_value),
+        self.assertEqual(len(debug.TABLES) *
+                         len(self.ip_ns_list_mock.return_value),
                          self.iptables_ns_mock.call_count)
         for ns in self.ip_ns_list_mock.return_value:
-            for table in tables:
+            for table in debug.TABLES:
                 self.assertIn(mock.call(ns, table),
                               self.iptables_ns_mock.call_args_list)