Distributed Firewall

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located elsewhere on the network. This paper describes the firewall's The distributed firewall is an important new line of network defense. It provides fine-grained access control to augment the protections afforded by the traditional perimeter firewall. To be effective, though, a distributed firewall must satisfy two critical requirements. First, it must embrace a protection model that acknowledges that everything behind the firewall may not be trustworthy. The malicious insider with unobstructed access the network can still mount limited attacks. Second, the firewall must be tamper-resistant. Any firewall that executes on the same untrusted operating system that it is charged to protect begs the question: who is protecting whom? This paper presents a new distributed, embedded firewall that satisfies both requirements. The firewall filters Internet Protocol traffic to and from the host. The firewall is tamper-resistant because it is independent of the host's operating system. It is implemented on the host's network interface card and managed by a protected, central policy server architecture and associated assurance claims and discusses unique applications for it.

Computers and Networking have become inseparable by now. A number of confidential transactions occur every second and today computers are used mostly for transmission rather than processing of data. So Network Security is needed to prevent hacking of data and to provide authenticated data transfer. Network Security can be achieved by Firewall. Conventional firewalls rely on the notions of restricted topology and controlled entry points to function. Restricting the network topology, difficulty in filtering of certain protocols, End-to-End encryption problems and few more problems lead to the evolution of Distributed Firewalls.
A distributed firewall is a mechanism to enforce a network domain security policy through the use of a policy language, a policy distribution scheme enabling policy control from a central point and certificates, enabling the identification of any member of the network policy domain.
Distributed firewalls secure the network by protecting critical network endpoints, exactly where hackers want to penetrate. It filters traffic from both the Internet and the internal network because the most destructive and costly hacking attacks still originate from within the organization.They provide virtually unlimited scalability. In addition, they overcome the singlepoint-of-failure problem presented by the perimeter firewall.
In our paper we deal with distributed firewall concepts, its evolution, its components, policies and a sample of the designed policy along with implementation. A distributed firewall gives complete security to the network.

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