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Code Editor : intro.html

<header>Fail2Ban Intrusion Detector</header>

Fail2Ban is a server that scans log files for entries indicating failed logins or
other attacks, and then performs actions such as firewalling or otherwise blocking
the sources of those attacks. This can be used to prevent brute-force password
guessing attempts by blocking the attacker before it can try a wide range of
passwords. <p>

The three major configuration object types in Fail2Ban are :

<dl>
<dt><b>Log Filters</b>
<dd>A filter is basically a regular expression that can be applied to a log file to
    match failed logins or other attacks. <p>

<dt><b>Match Actions</b>
<dd>An action is a set of commands that are run to block an attack. An action can also
    define commands to un-block an IP, and commands that are run when Fail2Ban starts up
    or shuts down. <p>

<dt><b>Filter Action Jails</b>
<dd>A jail is a combination of a filter, one or more actions, and one or more log files.
    The log is continually scanned for lines that match the filter, and when one is
    found the selected actions are performed. <p>
</dl>

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Code Editor : intro.html