diff --git a/doc/source/manual_tests/networking/Networking_Internal_DNS_resolution.rst b/doc/source/manual_tests/networking/Networking_Internal_DNS_resolution.rst
index 84cb1a9..51250cb 100644
--- a/doc/source/manual_tests/networking/Networking_Internal_DNS_resolution.rst
+++ b/doc/source/manual_tests/networking/Networking_Internal_DNS_resolution.rst
@@ -2,8 +2,74 @@
 Networking Internal DNS resolution
 ==================================
 
-
+Users of an OpenStack cloud would like to look up their instances by name in
+an intuitive way using the Domain Name System. This subdomain show the way
+that we are testing this feature.
 
 .. contents::
    :local:
    :depth: 1
+
+-----------------
+NET_IN_DNS_RES_03
+-----------------
+
+:Test ID: NET_IN_DNS_RES_03
+:Test Title: Disable internal DNS on AIO simplex system
+:Tags: DNS
+
+~~~~~~~~~~~~~~~~~~
+Testcase Objective
+~~~~~~~~~~~~~~~~~~
+
+This test case shows the way that DNS can be disabled and how is going to
+affect the communication with the VM's.
+
+~~~~~~~~~~~~~~~~~~~
+Test Pre-Conditions
+~~~~~~~~~~~~~~~~~~~
+
+a)Install any AIO symplex system.
+
+~~~~~~~~~~
+Test Steps
+~~~~~~~~~~
+
+1. Enable DNS resolution (Ml2 network service parameter will be created with
+   value=dns), by issuing the following commands:
+
+   ::
+
+      $ system service-parameter-add network ml2 exentsion_drivers=dns
+      $ system service-parameter-add network default dns_domain=<your_domain.com>
+
+
+2. Lock/Unlock controllers.
+
+3. Boot 2 VM's.
+
+4. Ping between VM's via their hostnames. The communication between VM's
+   should be successful.
+
+5. Perform VM actions: stop/pause/resume. VM's survives actions and internal
+   DNS resolution is not impacted.
+
+6. Disable DNS resolution by deleting system service parameter associated with
+   network/dns service.
+
+   ::
+
+      $ system service-parameter-delete <net-id>
+
+7. Lock/Unlock the controller.
+
+8. Create 2 new VM's.
+
+9. Attempt to ping between new VM's via their hostnames.
+
+~~~~~~~~~~~~~~~~~
+Expected Behavior
+~~~~~~~~~~~~~~~~~
+
+After disabling/deleting internal dns resolution, VM's shouldn't be able to
+resolve IP's via hostnames.