(Here we introduce the operation method of the two-wire HTB. Take the telecom and China Unicom lines as an example. In the two-wire HTB, we can add the priority control of the game port, that is, when a user downloads, he will not get stuck playing games. Here we focus on the HTB flow control method, and the two-wire routing rules are ignored. If you want to understand the principle of marked traffic well See PDF for more details:)