My Roon 2.0 core does not allow for ARC connection

[Robert_F]

Ralf, have you looked at this post on how to configure most Fritzboxes using port forwarding to support ARC?

Port Forwarding Instructions for (Most) Fritz!Box Users

Here comes a step by step setup for Fritzbox and should work with most fritz routers. There are two prerequisites: ensure that your ISP allows access from outside via a public ipv4 address. This is mostly the case but in some cases you need to pay extra for that. This is discussed here and here ensure that there are no other routers in between your router (fritzbox) and the roon core. If you have a setup with multiple routers or repeaters ensure that they are configured as a mesh that onl…