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How about built in <a href="https://en.wikipedia.org/wiki/Iptables" rel="ugc">https://en.wikipedia.org/wiki/Iptables</a>. &nbsp;<br />
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Also what kind of gateway firewall are you going to be using?
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How to install and configure ? I´ll have reports and logs ?
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IT should already be available. Most distributions come with iptables as primary firewall. <br />
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For configuration, this page from the FedoraProject provides good instructions.<br />
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<a href="https://fedoraproject.org/wiki/How_to_edit_iptables_rules" rel="ugc">https://fedoraproject.org/wiki/How_to_edit_iptables_rules</a>
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Do you plan to connect the server directly on your uplink or do you plan to have any router before it?<br />
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You can have some logs with IPTables depending on the rules you set, but what kind of reports did you have in mind?<br />
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Is the server behind a router? Do you plan it to be?
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I´m installing linux web server (debian/apache2/php/mysql)<wbr />. What free firewall I can use ? I´ll have one public address (200....) and one private address &nbsp;(192....)
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I´m installing linux web server (debian/apache2/php/mysql). What free firewall I can use ? I´ll have one public address (200....) and one private address  (192....)

firewall for linux web server

A web server refers to the software that helps to deliver web content that can be accessed either through the Internet or through an intranet. The primary function of a web server is to store, process and deliver web pages to clients. The communication between client and server takes place using the Hypertext Transfer Protocol (HTTP). The most common use of web servers is to host websites, but there are other uses such as gaming, data storage, running enterprise applications, handling email, FTP, etc.

Web Servers

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.