The Core IP displayed in your screenshot is in ffff:aaaa format and confirms that the router is assigning IPv6 addresses to devices on the LAN.
Per @mjw’s suggestion, the solution would normally be to disable IPv6 in the router configuration, but I don’t believe this is an option with your model.
Instead, according to the manual from the router’s manufacturer, there are IPv6 filters available that are intended as a workaround for IPv4 port forwarding.
It’s not the simplest, but I recommend trying the instructions on page 25 in this manual to set up an IPv6 filter for the IPv6 address listed on Core, using the same listening port (55000) Roon has set here. I don’t have this particular router, so I’m afraid I won’t be able to assist with the specifics here, but I can certainly try if you post the results of your experimentation here.
By the way, if you don’t mind me asking, who is your internet service provider?
I ask because we’re trying to document the particulars of ISP and router in our #arc-testing:port-forwarding-solved section, crystalizing situations like this into Wikis for future testers once we’ve got a workaround.
Ah, that makes sense, so this is an ISP-provided router? Thank you for the clarification. We’ll be standing by. I’ve retitled this post for housekeeping purposes and moved it to the #arc-testing:port-forwarding-progress section for now.
From what I understood from the last few days, the funny address you mentioned is an IPv6 address. And when Roon looks at it as the connection address it cannot get back to it. The 192.168.1.100 address is your internal ipv4 address that your internal network is using.
Based on what your ISP was saying, that they don’t support incoming data due to their CGNAT setup. It’s difficult from your perspective as it looks like there is not much you can do without getting more information.
Called provider again and this time I was told that I have to add a static IP address to my account for port forwarding to work. Done it for a fiver monthly and it should apply to my account within 24 hours.
I also checked if port 55000 was not blocked and they said it’s open.
Before I did port forwarding, I tried UPnP which did not work and I also see that now it shows no port available like it did before getting the static IP.
