Updating your DNS records with inwxupdate.rb

Apr 9, 2016

I’m running a couple of Raspberry Pis in my closet that are connected to the rest of the world by IPv6. For the obvious reasons each has its own DNS record at my favorite Registrar InterNetworX INWX.

Unfortunately the my ISP thinks it is a good idea to rotate IPv6-prefixes to keep my devices secure.

To get around this circumstance I’ve build a small script to keep the IP-addresses updated.

Feel free to use and fork inwxupdate.

This is how you use it:

gem install inwxupdate

You can update multiple DNS records at a time and get IPs from different network interfaces.

# inwxupdate.config.rb
CONFIG = {
  inwx_api: 'api.domrobot.com',
  inwx_user: 'your_username',
  inwx_pass: 'your_password',
  jobs: [
    {
      records: [
        { name: 'www.example.org', type: 'AAAA' },
        { name: 'v6.example.org', type: 'AAAA' }
      ],
      detector: {
        type: 'ifconfig',
        version: 6, # detect IPv6 address
        network_interface: 'en0'
      }
    },
    {
      records: [
        { name: 'v4.example.org', type: 'A' }
      ],
      detector: {
        type: 'ipify',
        version: 4, # detect IPv4 address (ipify does not support IPv6)
        network_interface: 'en0'
      }
  ],
  debug: false
}

Then run:

inwxupdate

Update: You can now use different Detectors for obtaining your IP address. See example config.