I want to use mobile music via ARC. I have setup the router Fritzbox as it was explained. Port for Roon is release 55000 and by trying to connect it was rejected. Following Analysis Result was shown:
The diagnostics you’ve provided suggest there is a redundant layer of network address translation preventing port forwarding.
This can either be at the local-network level (commonly as a result of two routers), or at the level of your service provider (in the form of carrier-grade NAT).
If your setup involves an ISP-provided gateway (modem/router combination) and your own third-party router:
In the web administration interface of the ISP-provided gateway (modem/router combination), enable Bridge Mode or equivalent, where the ISP-provided gateway does not have DHCP routing enabled.
Alternatively, if you have already created a manual port forwarding rule in your 3rd party router, you can add an additional rule to forward the port through the ISP/second router.
If you only have one router in your setup or your modem is already in Bridge mode, please take a look through our list of known router and internet service provider solutions, as other users may have already encountered the same situation: ISPs and Routers: List of Known Solutions and Workarounds
You can reach out directly to your service provider to ask if they support port forwarding; this question will often enough to prompt them to explain whether or not the carrier-grade NAT they’ve implemented can function with ARC.
More specifically, you can pass along the following questions:
Have you implemented carrier-grade NAT for my account level?
Have you fully implemented IPv6, or do you have IPv4 addresses available?
Can I request a static IPv4 address to support port forwarding?
Are there any ports you have reserved at the ISP level I should be aware of?
If you’re unable to locate an existing solution in our ARC: Port Forwarding Resources subcategory, please reach out to the Roon support team and include the following information:
What is the make and model of your modem and router?
Do you have any additional network hardware, like additional routers or managed switches?
Who is your internet service provider and what is your geographic region?
Is your Modem configured in Bridge Mode so that it operates only as a modem or do you have the ports forwarded on both?
today I had email traffic with support of my provider , so for the questions:
Have you implemented carrier-grade NAT for my account level? Yes, CGNAT is implemented
Have you fully implemented IPv6, or do you have IPv4 addresses available?* Yes, IPv6 is fully implemented, IPv4 adresses are not available
Can I request a static IPv4 address to support port forwarding? No
Are there any ports you have reserved at the ISP level I should be aware of? No
But what should I do now, which modification at Fritzbox I have do?
I don’t think you have specified your carrier. Did you ask specifically “Do you support Port Forwarding?” and “If so, How do I implement that on your router”. Those would be the two main questions.
CGNAT implementations vary by ISP. Some CGNAT can be used with IPv6 and Roon made some changes to facilitate this. However, not all ISP CGNAT implementations will work.