System recovery is described to characterize the ability that a firewall under testing recovers from an overload condition. In our paper, we present an approach to test the system recovery base on the traffic whose frame size obeys a specific distribution and figure out the system recovery time and the variance of the system recovery time. We implement the testing base on stress condition with overload traffic in different duration to figure out the D-d curve, which helps to show the stability

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... f the system recovery time as the duration of overload traffic increasing.