diff --git a/cinder/tests/unit/volume/drivers/test_kaminario.py b/cinder/tests/unit/volume/drivers/test_kaminario.py
index 360f36048a1..cc591372ed4 100644
--- a/cinder/tests/unit/volume/drivers/test_kaminario.py
+++ b/cinder/tests/unit/volume/drivers/test_kaminario.py
@@ -13,6 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 """Unit tests for kaminario driver."""
+import re
+
 import mock
 from oslo_utils import units
 import time
@@ -137,6 +139,7 @@ class TestKaminarioISCSI(test.TestCase):
         self.conf = mock.Mock(spec=configuration.Configuration)
         self.conf.kaminario_dedup_type_name = "dedup"
         self.conf.volume_dd_blocksize = 2
+        self.conf.unique_fqdn_network = True
 
     def _setup_driver(self):
         self.driver = (kaminario_iscsi.
@@ -527,6 +530,16 @@ class TestKaminarioISCSI(test.TestCase):
                                                              'test')
         self.assertIsNone(result)
 
+    def test_get_initiator_host_name(self):
+        result = self.driver.get_initiator_host_name(CONNECTOR)
+        self.assertEqual(CONNECTOR['host'], result)
+
+    def test_get_initiator_host_name_unique(self):
+        self.driver.configuration.unique_fqdn_network = False
+        result = self.driver.get_initiator_host_name(CONNECTOR)
+        expected = re.sub('[:.]', '_', CONNECTOR['initiator'][::-1][:32])
+        self.assertEqual(expected, result)
+
 
 class TestKaminarioFC(TestKaminarioISCSI):
 
@@ -553,3 +566,11 @@ class TestKaminarioFC(TestKaminarioISCSI):
         """Test terminate_connection."""
         result = self.driver.terminate_connection(self.vol, CONNECTOR)
         self.assertIn('data', result)
+
+    def test_get_initiator_host_name_unique(self):
+        connector = CONNECTOR.copy()
+        del connector['initiator']
+        self.driver.configuration.unique_fqdn_network = False
+        result = self.driver.get_initiator_host_name(connector)
+        expected = re.sub('[:.]', '_', connector['wwnns'][0][::-1][:32])
+        self.assertEqual(expected, result)
diff --git a/cinder/volume/drivers/kaminario/kaminario_common.py b/cinder/volume/drivers/kaminario/kaminario_common.py
index a77964cdbb6..db56a24b9c2 100644
--- a/cinder/volume/drivers/kaminario/kaminario_common.py
+++ b/cinder/volume/drivers/kaminario/kaminario_common.py
@@ -49,7 +49,16 @@ kaminario_opts = [
     cfg.BoolOpt('auto_calc_max_oversubscription_ratio',
                 default=False,
                 help="K2 driver will calculate max_oversubscription_ratio "
-                     "on setting this option as True.")]
+                     "on setting this option as True."),
+    cfg.BoolOpt('unique_fqdn_network',
+                default=True,
+                help="Whether or not our private network has unique FQDN on "
+                     "each initiator or not.  For example networks with QA "
+                     "systems usually have multiple servers/VMs with the same "
+                     "FQDN.  When true this will create host entries on K2 "
+                     "using the FQDN, when false it will use the reversed "
+                     "IQN/WWNN."),
+]
 
 CONF = cfg.CONF
 CONF.register_opts(kaminario_opts)
@@ -835,13 +844,20 @@ class KaminarioCinderDriver(cinder.volume.driver.ISCSIDriver):
                       'kaminario:replication': True}
 
     def get_initiator_host_name(self, connector):
-        """Return the initiator host name.
+        """Return the initiator host name or unique ID.
+
+        Unique ID when configuration's unique_fqdn_network is false will be
+        the reversed IQN/WWPNS.
 
         Valid characters: 0-9, a-z, A-Z, '-', '_'
         All other characters are replaced with '_'.
         Total characters in initiator host name: 32
         """
-        return re.sub('[^0-9a-zA-Z-_]', '_', connector.get('host', ''))[:32]
+        name = connector.get('initiator',
+                             connector.get('wwnns', [''])[0])[::-1]
+        if self.configuration.unique_fqdn_network:
+            name = connector.get('host', name)
+        return re.sub('[^0-9a-zA-Z-_]', '_', name[:32])
 
     def get_volume_group_name(self, vid):
         """Return the volume group name."""
diff --git a/releasenotes/notes/k2-non-unique-fqdns-b62a269a26fd53d5.yaml b/releasenotes/notes/k2-non-unique-fqdns-b62a269a26fd53d5.yaml
new file mode 100644
index 00000000000..76c3db28ba1
--- /dev/null
+++ b/releasenotes/notes/k2-non-unique-fqdns-b62a269a26fd53d5.yaml
@@ -0,0 +1,6 @@
+---
+issues:
+  - |
+    Kaminario K2 now supports networks with duplicated FQDNs via configuration
+    option `unique_fqdn_network` so attaching in these networks will work
+    (bug #1720147).