Ansible Role: ipaddr_hash

This is a simple tool that helps create IPv6 addresses based on a prefix and a "seed" value, like a hostname.

It’s great for anyone wanting a consistent way to assign IPv6 addresses to devices using their hostnames.

How It Works

The process to create an IP address is straightforward:

ip = prefix + (sha256(seed) & hostmask)

Requirements

None needed.

Role Variables

None to set.

Dependencies

• You need the Python module netaddr on your controller.

Example Playbook

Here’s how to use the ipaddr_hash filter:

- hosts: localhost
  tasks:
    - import_role:
        name: znerol.ipaddr_hash

    - debug:
        msg: "Generated IPv6 address for example.com with prefix '2001:db8::/64' is {{ '2001:db8::/64' | ipaddr_hash('example.com') }}"

This will produce the address: 2001:db8::13d2:1255:86ce:1947.

For more examples, see test/test.yml.

License

GPLv3