https://github.com/mhofer117/ispconfig-ddns-module Using the search function on Google or in the forum would have helped you. It still works fine with the current ISPConfig version.
@michelangelo thats what I mean with "There are some solutions on the net, but they are quite old" will they work with recent ISPconfig versions
That something is old is no indication that it's not working. Things that work simply do not need updates. Install itt, then you know if it works.
