disable ipv6 in router role

roles/router/tasks/main.yml

@@ -46,3 +46,8 @@
   ansible.posix.sysctl:
     name: net.ipv4.ip_forward
     value: '1'
+
+- name: Disable IPv6
+  ansible.posix.sysctl:
+    name: net.ipv6.conf.all.disable_ipv6
+    value: '1'