It’s a hard set closed port inbound for serving. I’m not sure a different router will work but I will look into it. At my prior residence I had fiber to the home and a direct Ethernet connection, so I was able to run my own firewall, control the ports, and have a commercial switch for all the computers. I miss my guaranteed asynchronous 1000/1000 connection. Now even with a Gig plan I’m lucky to get 300/30.