Internet WiFi distribution?

Question

WiFi

Such a question, there is a cellular operator. He had unlimited internet, I used it in a router and distributed it to a laptop. everything was ok until the operator began to cut the speed to 64kbps. How do they understand that I distribute the Internet? is it possible to cheat this possibility somehow? They indicate it will work only on your phone, but if I turn on the distribution from the phone, the situation does not change, the speed is low. who can tell me what the magic is.

Answer 1

Deep Packet Inspection (and not only it) is relatively easy for an operator to determine by

1. TTL (time to live) - value minus 1 (usually) if a device is connected in the distribution
   
2. MAC address inspection - of course, if possible
   
3. TCP/IP Stack Fingerprinting - Different devices have different "settings" for the protocol. The presence of different versions of prints for data transmission indicates distribution (the most popular)
   
4. The User-Agent of your browser is the most commonplace - different browsers access the network from different devices (different data in the User-Agent)
   

Well, and a lot of heuristic algorithms.
Well, or the operator set two APNs on your phone (unlikely, but it is included in the standard and is supported by devices) - when distributing, the phone reads the second APN and starts using it (and the operator has its own speeds and policies for this APN).
How to cheat? I will not rewrite articles here - they are easy to google.