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Abstract-In a networking context, Access Control Lists (ACLs) refer to security rules associated to network equipment, such as routers, switches and firewalls. Methods and tools to automate the management of ACLs distributed among several equipment shall verify if the corresponding ACLs are functionally equivalent. In this paper, we address such a verification process. We present a formal method to verify when two ACLs are isofunctional and illustrate our proposal over a practical example.

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