Prefer ipv6.

ansible/roles/network/defaults/main.yaml

@@ -0,0 +1 @@
+prefer_ipv6: false

ansible/roles/network/files/odofreebsd_network.conf

@@ -1,3 +1,4 @@
 wlans_iwlwifi0="wlan0"
 ifconfig_wlan0="WPA DHCP"
 ifconfig_wlan0_ipv6="inet6 accept_rtadv"
+ipv6_cpe_wanif="wlan0"

ansible/roles/network/tasks/freebsd.yaml

@@ -42,8 +42,6 @@
     state: present
     sysctl_file: "/etc/sysctl.conf.local"
   loop:
-    - name: net.inet6.ip6.accept_rtadv # Enable stateless autoconfiguration (SLAAC)
-      value: "1"
     - name: net.inet6.ip6.use_tempaddr # Enable privacy addresses
       value: "1"
     - name: net.inet6.ip6.prefer_tempaddr # Prefer privacy addresses
@@ -58,3 +56,20 @@
     group: wheel
   loop:
     - local_unbound
+
+- 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"
+
+- name: Don't Prefer ipv6
+  when: not prefer_ipv6
+  file:
+    path: "/etc/rc.conf.d/ip6addrctl"
+    state: absent