Honestly, i still dont think you have any ideia of what you are doing nor the reasons, it seems like you're just following tutorials expecting them to work for you and if you keep trying lots of different tutorials you might get luck, but if you really want to do anything related to pentest please LEARN about network, blindly following tutorials IS NOT learn, as thorin said when you understand the networking 101 you'll be able to accomplish what you want, so please do some reading/research.