docs/docs/stable/installer/en/firewall.xml


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<?xml version='1.0' encoding='UTF-8'?><section xmlns="http://docbook.org/ns/docbook" xmlns:ns5="http://www.w3.org/1998/Math/MathML" xmlns:ns4="http://www.w3.org/2000/svg" xmlns:ns3="http://www.w3.org/1999/xhtml" xmlns:ns2="http://www.w3.org/1999/xlink" xmlns:ns="http://docbook.org/ns/docbook" xml:id="firewall" version="5.0">
  <info>
    <title xml:id="firewall-ti1">Firewall</title>
  </info>

  <para xml:id="firewall-pa1" revision="1">This section allows you 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.</para>

  <para>In the default setting (no button is checked), no service of the
  system is accessible from the network. The <emphasis role="bold">Everything
  (no firewall)</emphasis> 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.</para>

  <para>All other options are more or less self-explanatory. As an example,
  you will enable the <emphasis role="bold">CUPS server</emphasis> if you want
  printers on your machine to be accessible from the network.</para>

  <para><emphasis role="bold">Advanced</emphasis></para>

  <para>The <emphasis role="bold">Advanced</emphasis> option opens a window
  where you can enable a series of services by typing a list of couples (blank
  separated)</para>

  <para><emphasis>&lt;port-number>/&lt;protocol></emphasis></para>

  <simplelist>
    <member>- <emphasis>&lt;port-number></emphasis> is the value of the
    port assigned to the service you want to enable (e.g. 873 for the RSYNC
    service) as defined in <emphasis>RFC-433</emphasis>;</member>

    <member>- <emphasis>&lt;protocol></emphasis> is one of
    <emphasis>TCP</emphasis> or <emphasis>UDP</emphasis> - the internet
    protocol that is used by the service.</member>
  </simplelist>

  <para>For instance, the entry for enabling access to the RSYNC service
  therefore is <emphasis>873/tcp</emphasis>.</para>

  <para>In case a service is implemented to use both protocols, you specify 2
  couples for the same port.</para>
</section>