diff --git a/tcp_tests/templates/_heat_environments/fragments/Compute.yaml b/tcp_tests/templates/_heat_environments/fragments/Compute.yaml
index 6b4c0c7..898f7c6 100644
--- a/tcp_tests/templates/_heat_environments/fragments/Compute.yaml
+++ b/tcp_tests/templates/_heat_environments/fragments/Compute.yaml
@@ -44,6 +44,11 @@
     properties:
       port_security_enabled: false
       network_id: { list_join: ['-', [ 'tenant_net', { get_param: env_name } ]] }
+  instance_port04:
+    type: OS::Neutron::Port
+    properties:
+      port_security_enabled: false
+      network_id: { list_join: ['-', [ 'external_net', { get_param: env_name } ]] }
 
   instance_instance:
     type: OS::Nova::Server
@@ -60,6 +65,7 @@
       - port: { get_resource: instance_port01 }
       - port: { get_resource: instance_port02 }
       - port: { get_resource: instance_port03 }
+      - port: { get_resource: instance_port04 }
       block_device_mapping_v2:
       - device_name: /dev/vdb
         device_type: disk
diff --git a/tcp_tests/templates/_heat_environments/fragments/Instance.yaml b/tcp_tests/templates/_heat_environments/fragments/Instance.yaml
index 1c9be45..29659ac 100644
--- a/tcp_tests/templates/_heat_environments/fragments/Instance.yaml
+++ b/tcp_tests/templates/_heat_environments/fragments/Instance.yaml
@@ -45,6 +45,12 @@
       port_security_enabled: false
       network_id: { list_join: ['-', [ 'tenant_net', { get_param: env_name } ]] }
 
+  instance_port04:
+    type: OS::Neutron::Port
+    properties:
+      port_security_enabled: false
+      network_id: { list_join: ['-', [ 'external_net', { get_param: env_name } ]] }
+
   instance_instance:
     type: OS::Nova::Server
     properties:
@@ -60,6 +66,7 @@
       - port: { get_resource: instance_port01 }
       - port: { get_resource: instance_port02 }
       - port: { get_resource: instance_port03 }
+      - port: { get_resource: instance_port04 }
       user_data_format: RAW
       user_data:
         str_replace:
diff --git a/tcp_tests/templates/_heat_environments/fragments/MasterNode.yaml b/tcp_tests/templates/_heat_environments/fragments/MasterNode.yaml
index 410deb6..885cace 100644
--- a/tcp_tests/templates/_heat_environments/fragments/MasterNode.yaml
+++ b/tcp_tests/templates/_heat_environments/fragments/MasterNode.yaml
@@ -41,6 +41,18 @@
       fixed_ips:
         - ip_address: { get_param: salt_master_control_ip }
 
+  instance_port03:
+    type: OS::Neutron::Port
+    properties:
+      port_security_enabled: false
+      network_id: { list_join: ['-', [ 'tenant_net', { get_param: env_name } ]] }
+
+  instance_port04:
+    type: OS::Neutron::Port
+    properties:
+      port_security_enabled: false
+      network_id: { list_join: ['-', [ 'external_net', { get_param: env_name } ]] }
+
   instance_instance:
     type: OS::Nova::Server
     properties:
@@ -55,6 +67,8 @@
       networks:
       - port: { get_resource: instance_port01 }
       - port: { get_resource: instance_port02 }
+      - port: { get_resource: instance_port03 }
+      - port: { get_resource: instance_port04 }
       block_device_mapping_v2:
       - device_name: /dev/cdrom
         device_type: cdrom