diff --git a/tripleoclient/tests/v1/undercloud/test_config.py b/tripleoclient/tests/v1/undercloud/test_config.py
index 0747ec708..83c48e2dd 100644
--- a/tripleoclient/tests/v1/undercloud/test_config.py
+++ b/tripleoclient/tests/v1/undercloud/test_config.py
@@ -31,6 +31,7 @@ from oslo_config import fixture as oslo_fixture
 
 from tripleo_common.image import kolla_builder
 
+from tripleoclient import exceptions
 from tripleoclient.tests import base
 from tripleoclient.v1 import undercloud_config
 
@@ -173,6 +174,15 @@ class TestNetworkSettings(base.TestCase):
                     'NetworkGateway': '192.168.24.1'}}}
         self.assertEqual(expected, env)
 
+    def test_nameserver_toomany_fail(self):
+        env = {}
+        self.conf.config(undercloud_nameservers=['1.1.1.1', '1.1.1.2',
+                                                 '1.1.1.3', '1.1.1.4',
+                                                 '1.1.1.5', '1.1.1.6'])
+        self.assertRaises(exceptions.InvalidConfiguration,
+                          undercloud_config._process_network_args,
+                          env)
+
     def test_start_end_all_addresses(self):
         self.conf.config(dhcp_start='192.168.24.0',
                          dhcp_end='192.168.24.255',
diff --git a/tripleoclient/v1/undercloud_config.py b/tripleoclient/v1/undercloud_config.py
index 0f38a79ed..432b54008 100644
--- a/tripleoclient/v1/undercloud_config.py
+++ b/tripleoclient/v1/undercloud_config.py
@@ -335,6 +335,11 @@ def _process_network_args(env):
                 env['UndercloudCtlplaneSubnets'][subnet].update(
                     {param_value: s[param_key]})
     env['MasqueradeNetworks'] = _generate_masquerade_networks()
+    if len(CONF['undercloud_nameservers']) > 5:
+        raise exceptions.InvalidConfiguration('Too many nameservers provided. '
+                                              'Please provide less than 6 '
+                                              'servers in undercloud_'
+                                              'nameservers.')
     env['DnsServers'] = ','.join(CONF['undercloud_nameservers'])