diff --git a/tobiko/openstack/stacks/__init__.py b/tobiko/openstack/stacks/__init__.py
index b8152ccf3..e2f48077e 100644
--- a/tobiko/openstack/stacks/__init__.py
+++ b/tobiko/openstack/stacks/__init__.py
@@ -27,6 +27,7 @@ from tobiko.openstack.stacks import _ubuntu
 CentosFlavorStackFixture = _centos.CentosFlavorStackFixture
 CentosImageFixture = _centos.CentosImageFixture
 CentosServerStackFixture = _centos.CentosServerStackFixture
+CentosExternalServerStackFixture = _centos.CentosExternalServerStackFixture
 
 CirrosFlavorStackFixture = _cirros.CirrosFlavorStackFixture
 CirrosImageFixture = _cirros.CirrosImageFixture
diff --git a/tobiko/openstack/stacks/_centos.py b/tobiko/openstack/stacks/_centos.py
index 1af312d51..14d744599 100644
--- a/tobiko/openstack/stacks/_centos.py
+++ b/tobiko/openstack/stacks/_centos.py
@@ -52,3 +52,8 @@ class CentosServerStackFixture(_nova.ServerStackFixture):
 
     #: Setup SWAP file in bytes
     swap_maxsize = 1 * 1024 * 1024 * 1024  # 1 GB
+
+
+class CentosExternalServerStackFixture(CentosServerStackFixture,
+                                       _nova.ExternalServerStackFixture):
+    pass
diff --git a/tobiko/tests/scenario/neutron/test_port.py b/tobiko/tests/scenario/neutron/test_port.py
index b8868a951..eb98a640e 100644
--- a/tobiko/tests/scenario/neutron/test_port.py
+++ b/tobiko/tests/scenario/neutron/test_port.py
@@ -113,7 +113,7 @@ class PortTest(testtools.TestCase):
 # --- Test opening ports on external network ----------------------------------
 
 @stacks.skip_unless_has_external_network
-class ExternalPortTest(PortTest):
+class CirrosExternalPortTest(PortTest):
     """Test Neutron ports"""
 
     #: Resources stack with Nova server to send messages to
@@ -121,6 +121,15 @@ class ExternalPortTest(PortTest):
         stacks.CirrosExternalServerStackFixture)
 
 
+@stacks.skip_unless_has_external_network
+class CentosExternalPortTest(PortTest):
+    """Test Neutron ports"""
+
+    #: Resources stack with Nova server to send messages to
+    stack = tobiko.required_setup_fixture(
+        stacks.CentosExternalServerStackFixture)
+
+
 # --- Test la-h3 extension ----------------------------------------------------
 
 @neutron.skip_if_missing_networking_extensions('l3-ha')