ARC problem germany Multiple NAT

[Jacob_Andersen]

Hi, have similar issues as many here, I looked at the post, but wasn’t able to solve the problem.

Core on iMac, 2019, 3.6/64RAM
Fiber Internet via “Glasfaser Stadtwerke Flensburg” - Wall mediaconverter “FiberTwist P2420” and router Fritzbox 7530. Core connected via ethernet

{
“connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“external_ip”: {“actual_external_ip”:“37.xxx.xxx.xx”,“router_external_ip”:“”},
“status”: “status”: MultipleNatFound
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“server_ip”:“192.168.178.1”,“found_upnp”:true}
}

[benjamin]

Hey @Jacob_Andersen,

Thanks for taking the time to write in! As a next step, please connect your core directly to your main modem and see if you run into the same error message.

If so, there is a chance your ISP is running CG-Nat, in which you’ll need to reach out to them to request a static IP address.

You can read more about that here:

ARC Port Forwarding

I’ll be monitoring this thread for your reply

[Jacob_Andersen]

I have no access to the fibernet wall box - after speaking with the provider, they say its not a router but just a “mediaconverter” with no remote access. They can’t offer me a static IP as a private person (only business customers), so as long as the setup of ARC is configured like this, I cannot use it.