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Network anomaly detection is an active research area in network community. Researchers have approached this problem using various techniques such as artificial intelligence, machine learning, state machine modeling, statistical approaches. The purpose of this preliminary work is to design an observer for network anomaly estimation for TCP/AQM (Transmission Control Protocol/Active Queue Management) networks using time delay system approach. Collaborating an observer with an AQM, constant anomalies considered as perturbations for the network can be detected. We illustrate the effectiveness of results via SIMULINK and the NS-2 simulator.