This isn’t a gab at you. But this question doesn’t make sense. I think the things you don’t know you don’t know about TCP and distributed system design make this difficult to pick apart.

Remember, your identity in a TCP connection is your IP address. If you connect from another IP and want your session to continue, identity must be handled higher in the stack.

TCP connection technically live forever by default. It’s up to either party to complete the handshake. Without that mechanism, your box would run out of ports.