6 months in, new router, new ISP, and I still can't get ARC working

[Geoff_Coupe]

So, your ISP is no longer a “guy in a flat with 18 cats”?

Cogent (ISP/Spain): I can't solve my multiple NAT problem and am running out of ideas

Oh, you might be into something here. My ISP is http://www.isrcomunicaciones.es/ But he is a guy in a flat with 18 cats and a fibre link. He has rigged up links to a small housing estate that was missed out by the big players. He might well be buying a high speed line from a real ISP and dividing it amongst his customers. There might well be a router between the other end of the microwave link and the fibre. I will ask him.

I suspect that your new ISP is doing something similar, however. He will have the router that needs to be set up with port forwarding I think…