WiFi and DoS

Hey everyone,

I'm trying to practice a DoS attack on my home network and I'm running into a number of problems. My question really is more about how my setup seems to work than anything else because when I connect I have the essid of my router which is something like "MyWiFi4d-5G" but I also have another connection available that is something like "13RR8J_V4". I'm assuming this is my modem? Both connections take the same password and when I scan for them they both will have the same MAC address although they don't appear at the same time.

So whats going on here with my setup? Thought about calling my ISP but I don't want to be questioned about what I'm doing legally in my own home for my own educational purposes. When I try the DoS attack it fails because if I attack the one connection my devices just switch to the other. I'm confused because both connections use the same MAC.

Thanks for the help, this noob appreciates it!