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The OpenFlow (OF) switching specification represents an innovative and open standard for enabling the dynamic programming of flow control policies in production networks. Unfortunately, thus far researchers have paid little attention to the development of methods for verifying that dynamic flow policies inserted within an OpenFlow network do not violate the network's underlying security policy. The authors introduce FLOVER, a model checking system which verifies that the aggregate of flow policies instantiated within an OpenFlow network does not violate the network's security policy. They have implemented FLOVER using the Yices SMT solver, which they then integrated into NOX, a popular OpenFlow network controller. FLOVER provides NOX a formal validation of the OpenFlow network's security posture.
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