Experimental IPv6 installbox.

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