https://overvolt.tech/hacking/msfvenom
https://www.packtpub.com/mapt/book/networking_and_servers/9781785883255/8/ch08lvl1sec58/shell-reverse-tcp-for-ios
https://null-byte.wonderhowto.com/how-to/perform-attack-over-wan-internet-0168583/
https://portforward.com/help/doublerouterportforwarding.htm