QoS in send or receive direction

When using QoS to regulate data transfer, you can decide whether the corresponding rule applies to the send or receive direction. Of course, whether a particular data transmission is being sent or received is a question of perspective. There are two variants:

The differences are made clear when we consider an FTP transfer. A client on the LAN is connected to the Internet via a device.

By default, a device evaluates the send or receive direction based on the logical connection establishment. In some applications this way of seeing things is not so obvious, and an alternative is to switch to considering the physical data stream.

Important: The distinction between the send and receive directions only applies for the setup of maximum bandwidths. For guaranteed minimum bandwidths, fragmentation and PMTU reduction, the direction is always taken to be the physical data transfer over the respective interface.

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