diff --git a/playbooks/zm.yml b/playbooks/zm.yml
index 319dbb3..0bdbe72 100644
--- a/playbooks/zm.yml
+++ b/playbooks/zm.yml
@@ -49,3 +49,9 @@
         owner: root
         group: "{{ ansible_wheel }}"
       notify: restart apache
+
+    - name: enable ntp server for cam network
+      lineinfile:
+        path: /etc/chrony.conf
+        regexp: "^#?allow .*"
+        line: "allow 172.20.26.0/24"