How can I identify a client on the server?
Suppose: 10,000 people use the services of an operator to provide communication in the local and Internet networks.
Every person on this network has:
external dynamic IP (can be the same for network users) and internal static IP.
For each person, an account on the server (the server is on the Internet) must be created automatically (login and password are generated by the server)
if you use different types of storages (local storage, cookies, flash storage, etc.) to store unique IDs that can be sent to the client from the server, then you can create as many accounts as you like (1000, 100000 or more) for the minimum amount of time.
Question: How to identify a person on the server, so that any device can be used (mobile, tablets, computers, nuotbuki)?