Enable ipv6 on homeserver.

ansible/roles/network/tasks/freebsd.yaml

@@ -59,14 +59,15 @@
 
 - name: Prefer ipv6
   when: prefer_ipv6
-  sysctl:
-    name: "{{ item.name }}"
-    value: "{{ item.value }}"
-    state: present
-    sysctl_file: "/etc/rc.conf.d/ip6addrctl"
-  loop:
-    - name: ip6addrctl_policy
-      value: "ipv6_prefer"
+  blockinfile:
+    path: "/etc/rc.conf.d/ip6addrctl"
+    marker: "# {mark} ANSIBLE MANAGED BLOCK"
+    create: true
+    mode: 0600
+    owner: root
+    group: wheel
+    block: |
+      ip6addrctl_policy="ipv6_prefer"
 
 - name: Don't Prefer ipv6
   when: not prefer_ipv6