Ethernet and Wifi
Ethernet and Wifi
Are you connected to the internet? Is your desktop's local IP address 192.168.0.12? That looks like a weak Wi-Fi setup for me. Adding your own router or Wi-Fi access point would be the solution. From the recent ping that passed through, they can communicate, so the networks aren't completely separate.
The issue might stem from several factors such as a malfunctioning printer, incorrect connection, or software problems. Check cables, power supply, and ensure the device is properly installed in the network.
Wireless guest network seems possible, but it's not usually turned on by default. It's been a challenge to recall exactly how it worked. Years ago I probably used DNS through Windows Network Locations. Priorities were set automatically. I wasn't sure how to tell Windows which NIC was faster so it would always choose wireless. That was because Windows decided. Now I'm using it for wired fiber or copper at 20Gbit speeds, and things have changed a lot over time.