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<article id="shorewall_features">
  <!--$Id$-->

  <articleinfo>
    <title>Shorewall Features</title>

    <author>
      <firstname>Tom</firstname>

      <surname>Eastep</surname>
    </author>

    <pubdate>2004-06-08</pubdate>

    <copyright>
      <year>2001-2004</year>

      <holder>Thomas M Eastep</holder>
    </copyright>

    <legalnotice>
      <para>Permission is granted to copy, distribute and/or modify this
      document under the terms of the GNU Free Documentation License, Version
      1.2 or any later version published by the Free Software Foundation; with
      no Invariant Sections, with no Front-Cover, and with no Back-Cover
      Texts. A copy of the license is included in the section entitled
      <quote><ulink url="GnuCopyright.htm">GNU Free Documentation License</ulink></quote>.</para>
    </legalnotice>
  </articleinfo>

  <section>
    <title>Features</title>

    <itemizedlist>
      <listitem>
        <para>Uses Netfilter&#39;s connection tracking facilities for stateful
        packet filtering.</para>
      </listitem>

      <listitem>
        <para>Can be used in<emphasis role="bold"> a wide range of
        router/firewall/gateway applications</emphasis> .</para>

        <itemizedlist>
          <listitem>
            <para>Completely customizable using configuration files.</para>
          </listitem>

          <listitem>
            <para>No limit on the number of network interfaces.</para>
          </listitem>

          <listitem>
            <para>Allows you to partition the network into <ulink
            url="Documentation.htm#Zones">zones</ulink> and gives you complete
            control over the connections permitted between each pair of zones.</para>
          </listitem>

          <listitem>
            <para>Multiple interfaces per zone and multiple zones per
            interface permitted.</para>
          </listitem>

          <listitem>
            <para>Supports nested and overlapping zones.</para>
          </listitem>
        </itemizedlist>
      </listitem>

      <listitem>
        <para><ulink url="shorewall_quickstart_guide.htm">QuickStart Guides
        (HOWTOs)</ulink> to help get your first firewall up and running
        quickly</para>
      </listitem>

      <listitem>
        <para>A <emphasis role="bold">GUI</emphasis> is available via Webmin
        1.060 and later (<ulink url="http://www.webmin.com">http://www.webmin.com</ulink>)</para>
      </listitem>

      <listitem>
        <para>Extensive <emphasis role="bold"><ulink
        url="Documentation_Index.html">documentation</ulink></emphasis> in
        available in both XML and HTML formats.</para>
      </listitem>

      <listitem>
        <para><emphasis role="bold">Flexible address management/routing
        support</emphasis> (and you can use all types in the same firewall):</para>

        <itemizedlist>
          <listitem>
            <para><ulink url="Documentation.htm#Masq">Masquerading/SNAT</ulink>.</para>
          </listitem>

          <listitem>
            <para><ulink url="FAQ.htm#faq1">Port Forwarding (DNAT)</ulink>.</para>
          </listitem>

          <listitem>
            <para><ulink url="NAT.htm">One-to-one NAT</ulink>.</para>
          </listitem>

          <listitem>
            <para><ulink url="ProxyARP.htm">Proxy ARP</ulink>.</para>
          </listitem>

          <listitem>
            <para><ulink url="netmap.html">NETMAP</ulink> (requires a 2.6
            kernel or a patched 2.4 kernel).</para>
          </listitem>
        </itemizedlist>
      </listitem>

      <listitem>
        <para><ulink role="bold" url="blacklisting_support.htm"><emphasis
        role="bold">Blacklisting</emphasis></ulink> of individual IP addresses
        and subnetworks is supported.</para>
      </listitem>

      <listitem>
        <para><ulink url="starting_and_stopping_shorewall.htm">Operational
        Support</ulink>.</para>

        <itemizedlist>
          <listitem>
            <para>Commands to start, stop and clear the firewall</para>
          </listitem>

          <listitem>
            <para>Supports status monitoring with an audible alarm when an
            <quote>interesting</quote> packet is detected.</para>
          </listitem>

          <listitem>
            <para>Wide variety of informational commands.</para>
          </listitem>
        </itemizedlist>
      </listitem>

      <listitem>
        <para><emphasis role="bold">VPN Support</emphasis>.</para>

        <itemizedlist>
          <listitem>
            <para><ulink url="Documentation.htm#Tunnels">IPSEC, GRE, IPIP and
            OpenVPN Tunnels</ulink>.</para>
          </listitem>

          <listitem>
            <para><ulink url="PPTP.htm">PPTP</ulink> clients and Servers.</para>
          </listitem>
        </itemizedlist>
      </listitem>

      <listitem>
        <para>Support for <ulink url="traffic_shaping.htm"><emphasis
        role="bold">Traffic</emphasis> Control/<emphasis role="bold">Shaping</emphasis></ulink>
        integration (although Shorewall itself contains no Traffic/Bandwidth
        control facilities).</para>
      </listitem>

      <listitem>
        <para>Wide support for different <emphasis role="bold">GNU/Linux
        Distributions</emphasis>.</para>

        <itemizedlist>
          <listitem>
            <para><ulink url="Install.htm#Install_RPM">RPM</ulink> and <ulink
            url="http://idea.sec.dico.unimi.it/%7Elorenzo/index.html#Debian">Debian</ulink>
            packages available.</para>
          </listitem>

          <listitem>
            <para>Includes automated <ulink url="Install.htm">install,
            upgrade, fallback and uninstall facilities</ulink> for users who
            can&#39;t use or choose not to use the RPM or Debian packages.</para>
          </listitem>

          <listitem>
            <para>Included as a standard part of <ulink
            url="http://leaf.sourceforge.net/devel/jnilo">LEAF/Bering</ulink>
            (router/firewall on a floppy, CD or compact flash).</para>
          </listitem>
        </itemizedlist>
      </listitem>

      <listitem>
        <para><ulink url="MAC_Validation.html">Media Access Control (<emphasis
        role="bold">MAC</emphasis>) Address <emphasis role="bold">Verification</emphasis></ulink>.</para>
      </listitem>

      <listitem>
        <para><emphasis role="bold"><ulink url="Accounting.html">Traffic
        Accounting</ulink>.</emphasis></para>
      </listitem>

      <listitem>
        <para><ulink url="bridge.html"><emphasis role="bold">Bridge</emphasis>/Firewall
        support</ulink> (requires a 2.6 kernel or a patched 2.4 kernel).</para>
      </listitem>
    </itemizedlist>
  </section>
</article>