Experimental IPv6 installbox.

roles/dhcp6radvdatftp/handlers/main.yml

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+---
+- name: restart radvd
+  systemd:
+    name: radvd.service
+    state: restarted
+    enabled: true
+  listen: restart radvd
+
+- name: restart kea-dhcp6-server
+  systemd:
+    name: kea-dhcp6-server.service
+    state: restarted
+    enabled: true
+  listen: restart kea-dhcp6-server
+
+- name: restart network interfaces
+  systemd:
+    name: networking
+    state: restarted
+  listen: reconfigure network

roles/dhcp6radvdatftp/tasks/main.yml

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+## DHCPv6, RAs and TFTP
+---
+- name: preseed aftpd
+  debconf:
+    name: atftpd
+    question: atftpd/basedir
+    value: /var/lib/tftpboot
+    vtype: string
+
+- name: install di-netboot-assistant and installer package
+  apt:
+    name:
+      - kea-dhcp6-server
+      - radvd
+      - atftpd
+    state: latest # noqa package-latest
+
+- name: configure radvd
+  template:
+    src: radvd.conf.j2
+    dest: /etc/radvd.conf
+    mode: 0644
+  notify: restart radvd
+
+- name: configure kea-dhcp-server
+  template:
+    src: kea-dhcp6.conf.j2
+    dest: /etc/kea/kea-dhcp6.conf
+    mode: 0644
+  notify: restart kea-dhcp6-server
+
+- name: set IPv6 address on interface
+  blockinfile:
+    path: /etc/network/interfaces
+    block: |
+      allow-hotplug {{ if_lan }}
+      iface {{ if_lan }} inet6 static
+         address 2001:db8:b001::1/64
+  notify: reconfigure network

roles/dhcp6radvdatftp/templates/kea-dhcp6.conf.j2

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+{
+   "Dhcp6": {
+      "interfaces-config": {
+         "interfaces": [ "{{ if_lan }}" ]
+      },
+      "option-data": [
+         {
+            "name": "bootfile-url",
+            "data": "tftp://[2001:db8:b001::1]/d-i/n-a/grubx64.efi"
+         }
+      ],
+      "subnet6": [
+         {
+            "subnet": "2001:db8:b001::/64",
+            "pools": [ { "pool": "2001:db8:b001::2 - 2001:db8:b001::ffff" } ],
+            "interface": "enp1s0"
+         }
+      ]
+   }
+}

roles/dhcp6radvdatftp/templates/radvd.conf.j2

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+interface {{ if_lan }}
+{
+   AdvSendAdvert on;
+   AdvManagedFlag on;
+   AdvOtherConfigFlag on;
+
+   prefix {{ prefix }}
+   {
+   };
+};