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Computer and Network security are the means of prevention and detection of unauthorized actions by users of computer system. The unauthorized action can be defined by the security policies which defines the security rules of a system. In most of the systems, the network security is achieved by firewall. A firewall is typically placed at the edge of a system and acts as a filter for unauthorized traffic. But there are some problems with these traditional firewalls like they rely on the notation of restricted topology and controlled entry points to function. Restricting the network topology, difficulty in filtering of certain protocols, end-to-end encryption problem and few more problems lead to the evolution of Distributed Firewalls.
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