pt_br/firewall.html


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                  <h2 class="title"><a name="firewall"></a>Firewall
                  </h2>
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         <p><a name="firewall-pa1"></a>This section allows to configure some simple firewall rules: they determine
            which type of message from the Internet will be accepted by the target
            system. This, in turn, allows the corresponding services on the system to be
            accessible from the Internet.
         </p>
         
           
         <p>In the default setting, no button is checked - no service of the system is
            accessibly from the network. The "<span class="emphasis"><em>Everything (no
                  firewall)</em></span>" button has a particular role: it enables access to all
            services of the machine - an option that does not make much sense in the
            context of the installer since it would create a totally unprotected
            system.  Its veritable use is in the context of the Mageia Control Center
            (which uses the same GUI layout) for temporarily disabling the entire set of
            firewall rules for testing and debugging purposes.
         </p>
         
           
         <p>All other checkbuttons are more or less self-explanatory. As an example, you
            will check the "CUPS server" button if you want printers on your machine to
            be accessible from the network.
         </p>
         
           
         <p><span class="bold"><strong>Avan&ccedil;ado</strong></span></p>
         
           
         <p>The set of checkbuttons only comprises the most common services. The
            "Advanced" button allows to enable messages that correspond to a service for
            which no checkbutton exists. The "<span class="emphasis"><em>Advanced</em></span>" button
            opens a window where you can enable a series of services by typing a list of
            couples (blank separated)
         </p>
         
           
         <p><span class="emphasis"><em>&lt;port-number&gt;/&lt;protocol&gt;</em></span></p>
         
           
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               <td>- <span class="emphasis"><em>&lt;port-number&gt;</em></span> is the value of the port assigned to
                  the service you want to enable (e.g. 873 for the RSYNC service) as defined
                  in <span class="emphasis"><em>RFC-433</em></span>;
               </td>
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               <td>- <span class="emphasis"><em>&lt;protocol&gt;</em></span> is one of <span class="emphasis"><em>TCP</em></span> or
                  <span class="emphasis"><em>UDP</em></span> - the internet protocol that is used by the
                  service.
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         <p>For instance, the entry for enabling access to the RSYNC service therefore
            is <span class="emphasis"><em>873/tcp</em></span>.
         </p>
         
           
         <p>In case a service is implemented to use both protocols, you specify 2
            couples for the same port.
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