Systems and methods for implementing flow control in communication networks to maximize data transmission of, and prevent loss of data by, the communication networks. Data flow status is designed to reach each network device where the decision to prioritize and buffer data is made. Where there are devices that do not provide flow control, flow control is provided on their behalf. For example, where a satellite modem does not provide flow control, a flow control device is provided in front of the modem. The flow control device knows the data transfer characteristics of the modem, for example by receiving data transfer status information from the modem or by modem characteristic information loaded into the flow control device, and creates flow control on its behalf.