systemd-networkd support for wan static ip address

roles/network/tasks/sysd-netd-debian.yml

@@ -49,6 +49,18 @@
     backup: no
   when: (wan_ip != "dhcp" or gui_static_wan_ip == "undefined") and is_ubuntu_18
 
+- name: Remove static WAN template
+  file:
+    state: absent
+    dest: /etc/systemd/network/IIAB-Static.network
+  when: wan_ip == "dhcp" and not is_ubuntu_18
+
+- name: Supply static WAN template
+  template:
+    dest: /etc/systemd/network/IIAB-Static.network
+    src: network/systemd-static-net.j2
+  when: wan_ip != "dhcp" and not is_ubuntu_18
+
 - name: Reload systemd
   systemd:
     daemon_reload: yes

roles/network/templates/network/systemd-static-net.j2

@@ -0,0 +1,12 @@
+# /etc/systemd/network/IIAB-static.network
+[Match]
+Name={{ iiab_wan_iface }}
+
+[Network]
+Address={{ wan_ip }}/{{ wan_cidr }}
+Gateway={{ wan_gateway }}
+LinkLocalAddressing=yes
+DNS={{ wan_namserver }}
+Domains={{ iiab_domain }}
+
+