I’ve set up an IPv6 native network in my home using Unique Local Addresses, and I’d like to tell the Internet-Box 2 about the ULA prefix I’m using, but there does not seem to be an obvious way to do it. My own router is sending route advertisements about the actual ULA prefixes I’m using, but apparently, the Internet-Box is not listening to those.

I would like to use Infomaniak as a DDNS provider, but it is not a choice offered on my Internet-Box. How should I proceed?