These reconnaissance probes/attacks affect every single device which faces the internet with a real IP address; routers and firewalls or devices behind a modem or bridge mode router. You can't do anything to stop them, short of disconnecting your router from the internet completely.
What your router logs are showing you is that these attacks are being stopped, which is good. They're more of academic interest rather than something you can do anything about.
If you want to make something on your home network available to the internet at large, such as a file server, Windows Remote Desktop or CCTV camera, the router logs serve to remind you that attackers are
trying to compromise your network and they will
find your open ports which they can then directly target with carefully crafted attacks.
Anyone running a service on their home network which is available to the outside world should take extra precautions to ensure it is protected. This includes things like using software to detect and prevent intrusions, logging access attempts and reviewing the logs, using strong password protection and multifactor authentication, and ensuring that the server software or device firmware is fully up to date with recommended security settings.
Above all, you've disabled UPnP, so let the logs reassure you that things aren't getting through.
Edited by caffn8me (Fri 27-Nov-20 10:28:58)