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Firewalls provide very good network security features. However, classical perimeter firewall deployments suffer from limitations due to complex network topologies and the inability to completely trust insiders of the network. Distributed firewalls are designed for alleviating these limitations. Intrusion detection is a mature technology and is very powerful when coupled with active response, which is the act of responding to intrusions without the need of human advisory. This paper describes an architecture that implements a distributed firewall with distributed active response.
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