diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index 1763808..4c7542a 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -490,7 +490,7 @@
         ports = self._list_ports(tenant_id=tenant_id)
         return len(ports)
 
-    def _create_subnet(self, network, namestart='subnet-smoke-'):
+    def _create_subnet(self, network, namestart='subnet-smoke-', **kwargs):
         """
         Create a subnet for the given network within the cidr block
         configured for tenant networks.
@@ -523,6 +523,7 @@
                     cidr=str_cidr,
                 ),
             )
+            body['subnet'].update(kwargs)
             try:
                 result = self.network_client.create_subnet(body=body)
                 break
@@ -680,6 +681,28 @@
                                                   private_key)
             linux_client.validate_authentication()
 
+    def _check_remote_connectivity(self, source, dest, should_succeed=True):
+        """
+        check ping server via source ssh connection
+
+        :param source: RemoteClient: an ssh connection from which to ping
+        :param dest: and IP to ping against
+        :param should_succeed: boolean should ping succeed or not
+        :returns: boolean -- should_succeed == ping
+        :returns: ping is false if ping failed
+        """
+        def ping_remote():
+            try:
+                source.ping_host(dest)
+            except exceptions.SSHExecCommandFailed:
+                LOG.exception('Failed to ping host via ssh connection')
+                return not should_succeed
+            return should_succeed
+
+        return tempest.test.call_until_true(ping_remote,
+                                            CONF.compute.ping_timeout,
+                                            1)
+
     def _create_security_group_nova(self, client=None,
                                     namestart='secgroup-smoke-',
                                     tenant_id=None):