added switch to optionally disable IPv4

[henningkerstan]

This adds a switch USE_IPV4 which can be used to disable updating the "A" record. A default setting to true is done in config-dist.php. Set USE_IPV4 to false and USE_IPV6 to true to only update the "AAAA" record, e.g. when using this script on a DS-Lite connection.

[stecklars]

Hello @henningkerstan,

Thank you for your work.

I think this is a good idea. I would be willing to merge this, however a lot has obviously changed in my script since your merge request (sorry that I was not able to look at this earlier). If you like, you could adapt it to the new version 3.0 of my script and I will take a look at it and merge it if there are no issues.

Kind regards

Lars

[stecklars]

Hi @henningkerstan,

Once again, thank you for your work on this.

The newly released version 4.0 of the script now offers this feature:
https://github.com/stecklars/dynamic-dns-netcup-api/releases/tag/v4.0