Hi @LarsB,
I’m sorry to hear that you’ve encountered an issue with carrier-grade NAT. Out of curiosity and for the benefit of other users on the forum, are you able to confirm your internet service provider?
It might be helpful to know the particulars of their implementation, and whether they have a dual-stack IPv6 infrastructure in place.
Roon is working on additional solutions to integrate ARC more smoothly with ISPs that have carrier-grade NAT, but these tickets are still in progress and won’t necessarily accommodate every situation. We should have more information in the coming weeks.
In the meantime, I recommend glancing at some of the #tinkering threads involving TailScale or even basic consumer VPNs. Here’s an example. Is there a way to get ARC working over VPN?