ARC: Either no access to UPnP (Bridge mode) OR Multiple NAT problem

Roon Core Machine

(MacBook Air 2020, M1, 8GB)

Networking Gear & Setup Details

@Jeppe2138, please share the diagnostics message found under Roon Settings > Roon ARC.

Thanks Martin, here’s a screenshot.

The full text should be in my original post as well.

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 #support:port-forwarding-resources subcategory, please reach out to the Roon support team and include the following information:

  1. What is the make and model of your modem and router?
  2. Do you have any additional network hardware, like additional routers or managed switches?
  3. Who is your internet service provider and what is your geographic region?
  4. Is your Modem configured in Bridge Mode so that it operates only as a modem or do you have the ports forwarded on both?

Hi @Jeppe2138,

We wanted to check in since this thread was in danger of auto-closing due to a lack of activity.

We’ve taken a quick glance at the basic account info that reaches our servers, and we can’t verify that you’ve been able to auto-configure or manually configure ARC with the steps above. Are you still stuck with a multipleNAT situation when attempting to set up ARC?

It the Settings page retains this error despite Bridging the upstream modem and verifying UPnP is on in your primary router, then I recommend trying a slightly different port assignment next to the static IP. If the diagnostic code still lists a multipleNAT situation, then it’s most likely CG-NAT on the part of your ISP, and you’ll need to inquire if a dedicated IPv4 address or IPv6 via full dual stack is available.

Thank you!

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