I installed DuckDNS add-on months ago and I have no problem getting into my Home Assistant using mydns.duckdns.org:8123
Works great.
But, I discovered recently that mydns.duckdns.org without the port 8123, I am directed to my router at 192.168.1.1
Anyone who knows mydns could get into my router settings. Worse yet, I can’t change the admin password on the router. (I’ll take that up with Verizon- wish me luck).
I wonder if changing my router’s IP address might fix this, or would I be asking for other trouble?
Just close down port 80 on your router (might be setting like allow remote admin), this should be the default. Otherwise you can get picked up by anyone port scanning.
That IP address isn’t routable on the internet, so I don’t see how any traffic could have been directed to it.