Fire wall fundamentals

Written security policies exist to provide a high-level roadmap of what needs to be done to ensure that the organization has a well-defined and thought-out security strategy

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The ICF, now dubbed Windows Firewall, is a simple stateful firewall that is part of the Windows XP operating system. In essence

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Personal and desktop firewalls are frequently overlooked as security devices that should be implemented on a network.

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The closer you come to the resource that needs to be protected, the more intelligent and specific you can get in filtering traffic directed at that resource.

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One of my favorite quotes is from Sun Tzu's The Art of War: If you know the enemy and know yourself, you need not fear the result of a hundred battles.

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There is no shortage of motives behind the threats that attackers come up with. Perhaps the most dangerous motive is the conscious decision to break the law, typically in an effort to gain some financial or monetary gain.

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Virtual private networks (VPNs) are another feature that firewalls have quickly adopted. Firewalls, by the very nature of their placement in the network design, represent a natural device to provide termination for LAN-to-LAN and in some cases remote-access VPNs.

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Using Firewalls to Segment Internal Resources Perhaps the most overlooked implementation of a firewall is on the internal network.

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User Datagram Protocol (UDP) UDP is the polar opposite of TCP. Whereas TCP is connection oriented, reliable, and relatively complex, UDP is a connectionless, unreliable

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This through a simple example of troubleshooting a firewall configuration. Troubleshooting starts with the basic connectivity troubleshooting and escalates upward to more complex issues until the specific problem is identified

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One of many third-party antivirus/Internet security suites, Trend Micro's PC-cillin includes a personal firewall that you can use to protect the system

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Transmission Control Protocol (TCP) TCP is a connection-oriented transport mechanism that resides at Layer 4 of the OSI model.

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To paraphrase Shrek, the network perimeter is like an onion; it has lots of layers.

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There are two predominant firewall architectures, the single-firewall and dual-firewall architectures.

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No discussion of firewall and security tools is complete without a brief discussion regarding security-testing tools.

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Consequently, a firewall is only as effective as the firewall security policy (as opposed to the enterprise security policy) that dictates how the firewall will be used

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Act as an intermediary between hosts Cache data to reduce the time and external bandwidth required to service requests

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Protocols, Services, and Applications As mentioned, TCP/IP provides a mechanism to allow systems to communicate with each other across a network.

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As with configuring any firewall, administrators should develop a checklist that they can use during the installation and implementation of the PIX/ASA firewall in the network

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The PIX/ASA is a powerful stateful packet-inspection firewall with some basic application-inspection capabilities.

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