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

# sysd-netd-debian.yml
- name: Copy the bridge script - Creates br0
  template:
    dest: /etc/systemd/network/IIAB-Bridge.netdev
    src: network/systemd-br0.j2
  when: iiab_lan_iface == "br0"

- name: Copy the bridge script - Assigns IP address
  template:
    dest: /etc/systemd/network/IIAB-Bridge.network
    src: network/systemd-br0-network.j2
  when: iiab_lan_iface == "br0"

# can be more than one wired interface
- name: Wired enslaving - Assigns lan_list_results to br0 as wired slaves if present
  template:
    src: network/systemd-br0-slave.j2
    dest: /etc/systemd/network/IIAB-Slave-{{ item|trim }}.network
  with_items:
    - "{{ lan_list_result.stdout_lines }}"
  when: iiab_wired_lan_iface is defined and num_lan_interfaces|int >= 1 and not network_manager_active

- name: Remove static WAN template
  file:
    state: absent
    dest: /etc/systemd/network/IIAB-Static.network
  when: wan_ip == "dhcp"

- name: Static IP computing CIDR
  shell: netmask {{ wan_ip }}/{{ wan_netmask }} | awk -F "/" '{print $2}'
  register: CIDR
  when: wan_ip != "dhcp"

- name: Static IP setting CIDR
  set_fact:
    wan_cidr: "{{ CIDR.stdout }}"
  when: wan_ip != "dhcp"

- name: Supply static WAN template (ubuntu-16)
  template:
    dest: /etc/systemd/network/IIAB-Static.network
    src: network/systemd-static-net.j2
  when: wan_ip != "dhcp" and is_ubuntu_16
  #when: wan_ip != "dhcp" and not is_ubuntu_18

- name: Stopping services
  include_tasks: down-debian.yml

- name: Reload systemd
  systemd:
    daemon_reload: yes

- name: Restart the systemd-networkd service
  systemd:
    name: systemd-networkd
    enabled: yes
    state: restarted
  when: (netplan.stdout is undefined or netplan.stdout.find("yaml") == -1) and not no_net_restart