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Wei Xie, "Adaptive verteilte Firewallkonfiguration basierend auf Linux-Netfilter," Master's Thesis, Department of Computer Science, Friedrich–Alexander University of Erlangen–Nuremberg (FAU), March 2008. (Advisors: Tobias Limmer and Falko Dressler)


The firewalls and Intrusion Detection Systems (IDS) are more and more used to protect network against attacks. When IDS recognizes some important secure events it will alarm the administrator. The IDS sends e.g. an email or an IDMEF message to administrator. As a reaction the administrator must configure firewalls to isolate some unfriendly hosts from network. After block the administrator must reconfigure the firewalls again to release them. In this work we discuss how to configure firewalls dynamically without administration so that the unfriendly hosts are blocked to reduce the ratio and number of attacks. In this master thesis a network based distributed system is developed to configure firewalls dynamically in an autonomous system. The system consists of a central manager and many agents who are located in firewall. The manager receives information from OSPF messages or static data from configuration file to recognize the topology of the protected network. The manager receives IDMEF messages of IDS and according to the current topology decides what new rules in which firewalls for how long must be added to block the malicious hosts. According to this decision the manager will send a Netconf message with new rules to the agents. The agents add the new coming rules in a rule queue in the firewall and will delete them from queue after time duration.

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Wei Xie

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    author = {Xie, Wei},
    title = {{Adaptive verteilte Firewallkonfiguration basierend auf Linux-Netfilter}},
    advisor = {Limmer, Tobias and Dressler, Falko},
    institution = {Department of Computer Science},
    location = {Erlangen, Germany},
    month = {3},
    school = {Friedrich--Alexander University of Erlangen--Nuremberg (FAU)},
    type = {Master's Thesis},
    year = {2008},

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