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Internet Firewall Security - Term Paper Example

Considering all these cons, one must ensure that a good firewall is in place to keep the hackers at an arm’s length, keeping them at bay is an arduous task. This paper will shed light upon internet firewall security and how a good firewall can protect a person from malware, Trojan horses and other undesirable viruses. Firewall Basics: “The term "fire wall" originally meant, and still means, a fireproof wall intended to prevent the spread of fire from one room or area of a building to another. The Internet is a volatile and unsafe environment when viewed from a computer-security perspective, therefore "firewall" is an excellent metaphor for network security.” (What is a firewall?) Firewall is not something general, it means several specific things and it is supposed to do several important things to ensure that a user is safeguarded against attacks. Packet filtering is perhaps the most important job of a regular firewall. All the internet activities like downloads, chats and so on are done in packets, and these packets contain information. Firewall must ensure that these packets are either allowed or disallowed based on the source of the internet protocol address known as the IP address. The destination port of these packets is also very important, the firewall is supposed to allow or disallow these packets purely on the basis of their destination port. Firewall must follow a protocol and allow or disallow packets or information based on the set protocol. This method of packet filtering is highly effective against malware and other dangerous attacks but this is not a foolproof plan. All traffic can be blocked by a firewall which does not make much sense; it should allow certain packets which are safe for the user to receive. It has its weaknesses like it becomes very difficult for a basic firewall to detect spoofing which means the information contained in the packets is falsified. Allowed packets may contain a bug which can retrieve a password and cause unwanted actions, a basic firewall is vulnerable to these dangers. Circuit relay is another type of firewall which provides enhanced security, application level gateway is perhaps the most advanced of all and provides even better security. Static Packet Filtering: “Static packet filtering is a firewall and routing capability that provides network packet filtering based only on packet information in the current packet and administrator rules.” (Statistic Packet Filtering) Static packet filtering is based on the following important things: The administrator defines rules. The allowed ports and IP addresses are set by the administrator and only the allowed ports are allowed to send and receive packets. The transport layer contents, the network and the packet contents are all determined by the administrator. Better level of security is provided by the dynamic packet filtering. Static packet filtering does not look at the contents closely, on the contrary dynamic packet filtering screens contents very closely, previous connection states are also considered by dynamic packet filtering which static packet filtering fails to do. The packet headers are very important under static packet filtering, the information stored in the headers determines whether packets should be allowed or dropped. These headers are compared against the control policy which is set by the administrator. Below is an illustration which presents the same concept very comprehensively. (Static Packet ...Show more
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Computer Sciences In APA Format Abstract The invention of the internet has made life unimaginably easier, one can shop online, transfer money online, book movie tickets online, book airline tickets online and in addition to this complete a host of other important tasks with just a few clicks…
Internet Firewall Security
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