updated where start is done.

tasks/main.yml

diff --git a/tasks/main.yml b/tasks/main.yml
index be7fa4a..69e320d 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -1,11 +1,22 @@
 ---
 # tasks file for apigee-opdk-iptables-port-block
+#- name: Using iptables to block a port
+#  become: true
+#  shell: "iptables -A INPUT -p tcp --destination-port {{ destination_port }} ! -s `hostname` -i eth0 -j DROP"
+#  environment:
+#    http_proxy: "{{ http_proxy }}"
+#    https_proxy: "{{ https_proxy }}"
+#    no_proxy: "{{ no_proxy }}"
+#    PORT_TIMEOUT: '{{ port_timeout | default(60) }}'
+#    UP_TIMEOUT: '{{ up_timeout | default(60) }}'
+
 - name: Using iptables to block a port
   become: true
-  shell: "iptables -A INPUT -p tcp --destination-port {{ destination_port }} ! -s `hostname` -i eth0 -j DROP"
-  environment:
-    http_proxy: "{{ http_proxy }}"
-    https_proxy: "{{ https_proxy }}"
-    no_proxy: "{{ no_proxy }}"
-    PORT_TIMEOUT: '{{ port_timeout | default(60) }}'
-    UP_TIMEOUT: '{{ up_timeout | default(60) }}'
+  iptables:
+    action: append
+    chain: INPUT
+    protocol: tcp
+    destination_port: "{{ destination_port }}"
+    source: "{{ inventory_hostname }}"
+    in_interface: eth0
+    policy: DROP