This paper discusses the firewall, a group of systems that enforces an access control policy between two networks to block traffic and to allow the traffic within the network.
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Paper Summary:
This paper explains that, for a firewall to work, it must be a part of a consistent overall organizational security architecture with realistic policies, which must reflect the level of security in the entire network. The author points out that application layer firewalls generally are host computers running proxy servers, which permit no traffic directly between networks, and which perform elaborate logging and auditing of traffic passing through them. The paper relates that a simple improvement is the use of an "intelligent filter,' which uses special firewall software to filter networks packets and services, thus offering a solution to better protection and logging possibilities.
Table of Contents
Description of Firewall
Technology Involved in Firewalls
Network Layer Firewalls
Application Layer Firewalls
Future Trend in the Area
Costs
The Companies Involved in the Firewalls
Regulatory Issues
Global Implications
From the Paper:
"These firewalls are based on the source, destination addresses, and ports. A simple router is the "traditional'' network layer firewall, but it is not able to make particularly sophisticated decisions about what a packet is actually talking to or where it actually came from. Modern network layer firewalls maintain internal information about the state of connections passing through them and the contents of some of the data streams. One thing that is an important distinction about many network layer firewalls is that they route traffic directly though them, so to use them a person needs to have a either validly assigned IP address block or a "private internet'' address block."
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