Based on that feedback, I did more digging and was able to set this correctly (I think, I still need to test outside my home).
I was able to log into my router by, of course, typing in the CORRECT IP Address in my browser (I’d initially used the wrong address). I followed the below configuration steps for my router and now Roon ARC on my core says “Ready.” So I think I’m good now.
The steps I followed, in case anyone also needs them, were:
- Go to your gateway address (mine was 192.168.0.1)
- Login. Default user/password is admin/password
- Go to the “Firewall” tab.
- Ensure that “Enable Firewall” is checked. (Be sure to hit “Apply” if you have to check it)
- Click on “Virtual Servers / Port Forwarding” on the left.
- Add an entry for your desired port and internal ip etc. (If you’re just forwarding one external port to the same internal port, then you’ll end up typing that same port # four times, twice in each range)
- Save.