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| Hosting > VPS > Linux VPS > Administration > | Monday, October 06, 2008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Linux VPS: Firewall - IntroductionA firewall monitors and controls the traffic coming into and out of your account. The traffic of the Internet consists of information which takes the form of data packets. A firewall evaluates each data packet and determines whether or not to pass the packet to your account. A firewall prevents your account from receiving an overwhelming quantity of unwanted traffic. Some of the unwanted traffic may be simply bothersome. Other traffic may actually be sent from malicious Internet users who intend to make your account inoperable. Either way, building a firewall is an important configuration task for you to consider. This document provides you with the information you need to understand, get started, and utilize preset firewall security settings using a custom, simplified command (set_fwlevel). Although this document provides an overview of the iptables command line utility, it is does not provide the details of how to build a firewall with the utility. Knowledgeable administrators who wish to utilize the utility should refer to other resources and documentation. All who use the iptables command-line utility should carefully consider all of the tasks they perform with that utility. Always make back up files, stored remotely, for iptables configurations and settings you have previously tested and used. This document provides an update to the following print-ready customer documentation which is included, at no cost, as a feature of your Linux VPS server:
This document includes the following sections:
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