Firewalls are crucial elements in enforcing network security policies. They have been widely deployed for securing private networks but, their configuration remains complex and error prone. During the last years, many techniques and tools have been proposed to correctly configure firewalls. However, most of existing works are informal and do not take into account the global performance of the network or other qualities of its services (QoS). In this paper we introduce a formal approach allowing to formally and optimally configure a network so that a given security policy is respected and by taking into account the QoS.
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