diff --git a/craton/api/v1/schemas.py b/craton/api/v1/schemas.py
index 29fa368..0a0be15 100644
--- a/craton/api/v1/schemas.py
+++ b/craton/api/v1/schemas.py
@@ -1325,7 +1325,7 @@ validators = {
                     "type": "string",
                 },
                 "port": {
-                    "type": "string",
+                    "type": "integer",
                 },
                 "duplex": {
                     "type": "string",
diff --git a/craton/tests/functional/__init__.py b/craton/tests/functional/__init__.py
index afaa2cc..08e5896 100644
--- a/craton/tests/functional/__init__.py
+++ b/craton/tests/functional/__init__.py
@@ -217,6 +217,9 @@ class TestCase(testtools.TestCase):
     def assertNoContent(self, response):
         self.assertEqual(requests.codes.NO_CONTENT, response.status_code)
 
+    def assertBadRequest(self, response):
+        self.assertEqual(requests.codes.BAD_REQUEST, response.status_code)
+
     def get(self, url, headers=None, **params):
         resp = self.session.get(
             url, verify=False, headers=headers, params=params,
diff --git a/craton/tests/functional/test_network_interface_calls.py b/craton/tests/functional/test_network_interface_calls.py
new file mode 100644
index 0000000..65cac55
--- /dev/null
+++ b/craton/tests/functional/test_network_interface_calls.py
@@ -0,0 +1,57 @@
+from craton.tests import functional
+
+
+class APIv1NetworkInterfacesTest(functional.DeviceTestBase):
+    def setUp(self):
+        super(APIv1NetworkInterfacesTest, self).setUp()
+        self.interfaces_url = self.url + '/v1/network-interfaces'
+
+    def test_associate_network_device_with_a_host(self):
+        host = self.create_host('host-0', 'server', '127.0.0.1')
+
+        payload = {
+            'name': 'lo',
+            'ip_address': '127.0.0.1',
+            'device_id': host['id'],
+            'interface_type': 'loopback',
+        }
+        response = self.post(self.interfaces_url, data=payload)
+        self.assertSuccessCreated(response)
+        self.assertIn('Location', response.headers)
+        interface = response.json()
+        self.assertEqual(
+            '{}/{}'.format(self.interfaces_url, interface['id']),
+            response.headers['Location']
+        )
+
+    def test_port_must_be_an_integer_on_create(self):
+        host = self.create_host('host-0', 'server', '127.0.0.1')
+
+        payload = {
+            'name': 'lo',
+            'ip_address': '127.0.0.1',
+            'device_id': host['id'],
+            'interface_type': 'loopback',
+            'port': 'asdf',
+        }
+        response = self.post(self.interfaces_url, data=payload)
+        self.assertBadRequest(response)
+
+    def test_port_must_be_an_integer_on_update(self):
+        host = self.create_host('host-0', 'server', '127.0.0.1')
+
+        payload = {
+            'name': 'lo',
+            'ip_address': '127.0.0.1',
+            'device_id': host['id'],
+            'interface_type': 'loopback',
+            'port': 80,
+        }
+        response = self.post(self.interfaces_url, data=payload)
+        self.assertSuccessCreated(response)
+        interface = response.json()
+
+        url = self.interfaces_url + '/{}'.format(interface['id'])
+        payload = {'port': 'asdf'}
+        response = self.put(url, data=payload)
+        self.assertBadRequest(response)