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The congestion control problem in data networks is analyzed here from the point of view of control systems, and some solutions are compared. By analyzing in detail their linearized transfer functions, it is discussed why TCP Westwood and TCP NewReno present different behavior when dealing with the same network conditions, showing why TCPWestwood gives better performance. Moreover it is shown that adequate stability and performance can be obtained, even in the presence of the wide variations in the parameters of the networks, as long as the controller is properly designed.