How to make program that lock connection on Windows 10

Question

I want to troll my brother. It's just for fun not for damaging computer or anything.

Answer 1

Wdym by 'lock' ? You don't need to use a program, just go to 192.168.1.1 (sometiemes 192.168.1.0) and add his ip address to the blacklist

Answer 2

No , I want to do something he can't connect to the wifi a it's say something u has been hacker

Answer 3

Hacked*