ARC not connecting to ROON core Synology NAS

[Daniel_Bushaway]

Roon Core Machine

Networking Gear & Setup Details

1. Who is your internet service provider?

2. Please list the make and model of your modem and router?

3. Do you have any additional network hardware, like additional routers or managed switches?

4. Does your network have any VPNs, proxy servers, or enterprise-grade security?

Connected Audio Devices

I am using a T P Link Archer 64 and need some help with trouble shooting please.

This is the error:

Description of Issue -

What is the exact port forwarding error message you see in the Roon Settings → ARC tab?

{
“connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“external_ip”: {“actual_external_ip”:“121.aaa.bbb.ccc”,“actual_external_ipv6”:“fd83:b692:AAAA:BBBB:CCCC:DDDD:32ff:feaa:6a35”,“router_external_ip”:“100.ddd.eee.fff”},
“status”: “status”: MultipleNatFound
,
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“server_ip”:“192.168.0.1”,“found_upnp”:true}
}

I have tried both manual port forwarding and upnp.

I use a Synology NAS DS1819+ running DSM7.

I run the ROON software in a container/docker as the update to the server didn’t support Roon at the time.

Could this be the issue?

Thanks, Dan

[Bernd_Kurte (Bernd)]

@Daniel_Bushaway

“status”: “status”: MultipleNatFound

Here is your problem.
Either you are using multiple routers in your home or your ISP carrier is using CG-NAT.

[Daniel_Bushaway]

Hi Berns, thanks for your response. If this is the case what’s the fix for it?

[Martin_Webster]

As @Bernd_Kurte says, 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?

[Daniel_Bushaway]

Thanks to @Bernd_Kurte and for your more lengthy help guide @Martin_Webster it was indeed the CG-NAT which I have had removed and all works perfectly. Thanks Dan