A firewall is a security guard placed between a private network and the outside Internet that monitors all incoming and outgoing packets. The function of a firewall is to examine every packet and decide whether to accept or discard it based upon the firewall's policy. This policy is specified as a sequence of (possibly conflicting) rules. With the explosive growth of Internet-based applications and malicious attacks, the number of rules in firewalls have been increasing rapidly, which consequently degrades network performance and throughput. This paper proposes Firewall Compressor, a framework that can significantly reduce the number of rules in a firewall while keeping the semantics of the firewall unchanged.
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