So basically theres someone living in my house connecting devices to my router using ports without permission. I see 7 SSID channels and new ones created on the daily basis that have signals just as strong as my SSID. And my router is in the basement. On top of that Ive downloaded networking tools to my I-phone and found a unique IP address for my router. This person has my internet password. However, instead of linking to the router through a basic wireless connection. They have went the distance to use other means (hacking) to connect to the internet. The only reason I could think of is to make sure I could not see the devices they were connecting, i.e., hidden cameras etc..The sad part is this individual is not my wife. Its a child. I was trying to find a way to block it, but im at the point to getting law enforcement involved. Any Help. I have a Xfi Gateway 3rd Generation Router XB7 CM router and MAC OS HiGH SIERRA PC.