This paper presents a new method for real-time monitoring of available bandwidth over a network path. The method uses active probing with trains of probe packets, and produces estimates in real-time using Kalman filtering. It improves the estimate for each new measurement of the strain of the inter-packet time intervals in a probe packet train. This paper has tested the method with good accuracy and agreement, both in simulation and in a physical test network. The method requires no communication from receiver to sender and only minor processing and memory space.
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