ARC through SIM mobile receiver


I am connecting to internet using a NR7101 Zyxel antenna. It enables 5g anywhere available. I am connecting to the Swisscom mobile network. it is especially useful in areas of the Alps no provider has reached to.

It seems difficult to connect to ARC though. The device allows to define a port forwarding, even APN and a lot of setups I don’t understand. But I am drowning me in all possibilities.

Would it be possible to help on how to setup this device and enable ARC?

Thanks and look forward to advice.


Hello, and welcome to the Forum. I’ve moved your post into the #support:port-forwarding-help category, where it will be seen by the Support team.

Can you post the error message that you get when you go to Settings > Roon ARC and try to configure your Core for Roon ARC? - edit the message to remove your external IP address if shown, and replace it with “xxxx” - posting that on a public forum, like posting your email address, is not a good idea.

You are using the mobile network of Swisscom. I suspect that Swisscom is using Carrier-grade NAT in its mobile network - that gives you a private external IP address, known only to Swisscom, and not accessible from the rest of the internet.

If this is the case, then Swisscom will need to give you a public IP address (either static or dynamic) for ARC to work. Can you check with them whether they can do this?

Thank you. Please find the message below:


“connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},

“external_ip”: {“actual_external_ip”:“xxxx”,“router_external_ip”:“yyyy”},

“status”: “status”: MultipleNatFound


“natpmp_autoconfig”: {“status”:“NotFound”},

“upnp_autoconfig”: {“server_ip”:“”,“found_upnp”:true}


I believe that your multiple NAT situation is being caused by Swisscom’s use of CG-NAT. Can you check with them, and if so, ask them for a public IP address to be assigned to your connection?

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I have asked them even though not so clearly. From what I understood there are limitation’s on the mobile network. I can try again and keep you in touch.

Like the T-Mobile mobile internet in America it may just not be possible at this time. Roon has mentioned they are continuing to look for options for those stuck with this issue.

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