shorewall_code/docs/starting_and_stopping_shorewall.xml

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  <!--$Id$-->

  <articleinfo>
    <title>Operating Shorewall and Shorewall Lite</title>

    <authorgroup>
      <author>
        <firstname>Tom</firstname>

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

    <pubdate><?dbtimestamp format="Y/m/d"?></pubdate>

    <copyright>
      <year>2004</year>

      <year>2005</year>

      <year>2006</year>

      <year>2007</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>

  <caution>
    <para><emphasis role="bold">This article applies to Shorewall 3.0 and
    later. If you are running a version of Shorewall earlier than Shorewall
    3.0.0 then please see the documentation for that
    release</emphasis>.</para>
  </caution>

  <section>
    <title>Operational Components</title>

    <para>There are a number of files that comprise the operational components
    of Shorewall.</para>

    <itemizedlist>
      <listitem>
        <para><filename>/sbin/shorewall</filename> — The program that you use
        to interact with Shorewall. Normally the root user's PATH includes
        <filename>/sbin</filename> and the program can be run from a shell
        prompt by simply typing <command>shorewall</command> followed by a
        command.</para>

        <warning>
          <para>In some releases of KDE, the default configuration of the
          <emphasis role="bold">konsole</emphasis> program is brain dead with
          respect to the "Root Console". It executes the command "su" where it
          should execute "su -"; the latter will cause a login shell to be
          created which will in turn set PATH properly. You can correct this
          problem as follows:</para>

          <orderedlist>
            <listitem>
              <para>Click on "Settings" on the toolbar and select "Configure
              Konsole"</para>
            </listitem>

            <listitem>
              <para>Select the "Session" tab.</para>
            </listitem>

            <listitem>
              <para>Click on "Root Console"</para>
            </listitem>

            <listitem>
              <para>Change the Execute command from "su" to "su -"</para>
            </listitem>

            <listitem>
              <para>Click on "Save Session"</para>
            </listitem>

            <listitem>
              <para>Click on "Ok"</para>
            </listitem>
          </orderedlist>
        </warning>

        <para>To see a list of supported commands, use the
        <command>help</command> command:</para>

        <programlisting><command>shorewall help</command></programlisting>

        <para>To get further information about a particular command, follow
        <command>help</command> by the command:</para>

        <programlisting><command>shorewall help start</command></programlisting>
      </listitem>

      <listitem>
        <para><filename>/etc/shorewall</filename> — The default directory
        where Shorewall looks for configuration files. See the sections
        entitled <link linkend="AddDirectories">Additional Configuration
        Directories</link> and <link linkend="AltConfig">Alternate
        Configuration Directories</link> for information about how you can
        direct Shorewall to look in other directories.</para>
      </listitem>

      <listitem>
        <para><filename>/etc/init.d/shorewall</filename>
        (<filename>/etc/rc.d/rc.firewall</filename> on Slackware) — The script
        run by <command>init</command> (the program responsible for startup
        and shutdown of your system) to start Shorewall at boot time and to
        stop Shorewall at shutdown.</para>
      </listitem>

      <listitem>
        <para><filename>/usr/share/shorewall/compiler</filename> — In
        Shorewall 3.1 and later, the program that processes your Shorewall
        configuration files and creates a script to start, stop, restart,
        restore and clear the firewall.</para>
      </listitem>

      <listitem>
        <para><filename>/usr/share/shorewall/firewall</filename> — In
        Shorewall 3.0 and earlier, the program responsible for configuring
        Netfilter based on your configuration files. In 3.2 and later
        versions, this program implements the add, delete, stop, clear and
        refresh commands.</para>
      </listitem>

      <listitem>
        <para><filename>/usr/share/shorewall/functions</filename> — A library
        of Bourne Shell functions used by<filename>
        /sbin/shorewall</filename>,
        <filename>/usr/share/shorewall/compiler</filename> and
        <filename>/usr/share/shorewall/firewall</filename>.</para>
      </listitem>
    </itemizedlist>

    <para>There are similar components that comprise <ulink
    url="CompiledPrograms.html#Lite">Shorewall Lite</ulink>:</para>

    <itemizedlist>
      <listitem>
        <para><filename>/sbin/shorewall-lite</filename> — This is the program
        that you use to interact with Shorewall Lite.</para>
      </listitem>

      <listitem>
        <para><filename>/etc/shorewall-lite</filename> — Directory where the
        configuration file for Shorewall Lite resides.</para>
      </listitem>

      <listitem>
        <para><filename>/var/lib/shorewall-lite/firewall</filename> — The
        firewall program. It is generated and placed on the Shorewall LIte
        system through use of the <command>shorewall load</command> and
        <command>shorewall reload </command>commands on a system with the full
        Shorewall product installed.</para>

        <note>
          <para>The 'firewall' script is in <filename
          class="directory">/var/lib/shorewall-lite</filename> in packages
          from shorewall.net. The package maintainers for the various
          distributions are free to choose the directory where the script will
          be stored under their distribution by changing the value of LITEDIR
          in /usr/share/shorewall[-lite]/configpath. See the output of
          <command>shorewall[-lite] show config</command> for the value of
          LITEDIR on your distribution.</para>

          <para>Example:</para>

          <programlisting>gateway:~ # <command>shorewall-lite show config</command>
Default CONFIG_PATH is /etc/shorewall-lite:/usr/share/shorewall-lite
LITEDIR is /var/lib/shorewall-lite
gateway:~ #</programlisting>
        </note>
      </listitem>

      <listitem>
        <para><filename>/usr/share/shorewall-lite/functions</filename> — A
        library of Bourne Shell functions used by<filename>
        /usr/share/shorewall-lite/shorewall</filename>.</para>
      </listitem>
    </itemizedlist>
  </section>

  <section>
    <title>Starting, Stopping and Clearing</title>

    <para>As explained in the <ulink
    url="Introduction.html">Introduction</ulink>, Shorewall is not something
    that runs all of the time in your system. Nevertheless, for integrating
    Shorewall into your initialization scripts it is useful to speak of
    <firstterm>starting</firstterm> Shorewall and
    <emphasis>stopping</emphasis> Shorewall.</para>

    <itemizedlist>
      <listitem>
        <para>Shorewall is started using the <command>shorewall
        start</command> command. Once the start command completes
        successfully, Netfilter is configured as described in your Shorewall
        configuration files. If there is an error during <command>shorewall
        start</command>, then if you have a <firstterm>saved
        configuration</firstterm> then that configuration is restored.
        Otherwise, an implicit <command>shorewall stop</command> is
        executed.</para>

        <important>
          <para>Beginning with Shorewall 3.1, <command>shorewall
          start</command> is implemented as a <firstterm>compile and
          go</firstterm>; that is, the configuration is compiled and if there
          are no compilation errors then the resulting compiled script is
          executed. If there are compilation errors, the command is aborted
          and the state of the firewall is not altered.</para>
        </important>
      </listitem>

      <listitem>
        <para>Shorewall is stopped using the <command>shorewall stop</command>
        command.</para>

        <important>
          <para>The <command>shorewall stop</command> command does not remove
          all netfilter rules and open your firewall for all traffic to pass.
          It rather places your firewall in a safe state defined by the
          contents of your <ulink
          url="Documentation.htm#Routestopped">/etc/shorewall/routestopped</ulink>
          file and the setting of ADMINISABSENTMINDED in <ulink
          url="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</ulink>.</para>
        </important>
      </listitem>

      <listitem>
        <para>If you want to remove all Netfilter rules and open your firewall
        for all traffic to pass, use the <command>shorewall clear</command>
        command.</para>
      </listitem>

      <listitem>
        <para>If you change your configuration and want to install the
        changes, use the <command>shorewall restart </command>command.</para>
      </listitem>
    </itemizedlist>

    <para>For additional information, see the<link linkend="State"> Shorewall
    State Diagram</link> section.</para>
  </section>

  <section>
    <title>Tracing Command Execution</title>

    <para>If you include the word <emphasis role="bold">trace</emphasis> as
    the first parameter to an <filename>/sbin/shorewall</filename> command
    that transfers control to
    <filename>/usr/share/shorewall/firewall</filename>, execution of the
    latter program will be traced to STDERR.</para>

    <example>
      <title>Tracing <command>shorewall start</command></title>

      <para>To trace the execution of <command>shorewall start</command> and
      write the trace to the file <filename>/tmp/trace</filename>, you would
      enter:<programlisting><command>shorewall trace start 2&gt; /tmp/trace</command></programlisting></para>
    </example>
  </section>

  <section>
    <title>Having Shorewall Start Automatically at Boot Time</title>

    <para>The .rpm, .deb and .tgz all try to configure your startup scripts so
    that Shorewall will start automatically at boot time. If you are using the
    <command>install.sh </command>script from the .tgz and it cannot determine
    how to configure automatic startup, a message to that effect will be
    displayed. You will need to consult your distribution's documentation to
    see how to integrate the <filename>/etc/init.d/shorewall</filename> script
    into the distribution's startup mechanism.<caution>
        <itemizedlist>
          <listitem>
            <para>Shorewall startup is disabled by default. Once you have
            configured your firewall, you can enable startup by editing
            <filename>/etc/shorewall/shorewall.conf</filename> and setting
            STARTUP_ENABLED=Yes.. Note: Users of the .deb package must rather
            edit <filename>/etc/default/shorewall</filename> and set
            <quote>startup=1</quote>.</para>
          </listitem>

          <listitem>
            <para>If you use dialup or some flavor of PPP where your IP
            address can change arbitrarily, you may want to start the firewall
            in your <command>/etc/ppp/ip-up.local</command> script. I
            recommend just placing <quote><command>/sbin/shorewall
            restart</command></quote> in that script.</para>
          </listitem>
        </itemizedlist>
      </caution></para>
  </section>

  <section id="Saved">
    <title>Saving a Working Configuration for Error Recovery and Fast
    Startup</title>

    <para>Once you have Shorewall working the way that you want it to, you can
    use <command>shorewall save</command> to <firstterm>save</firstterm> the
    commands necessary to recreate that configuration in a <firstterm>restore
    script</firstterm>.</para>

    <para>In its simplest form, the save command is just:</para>

    <programlisting><command>shorewall save</command></programlisting>

    <para>That command creates the default restore script,
    <filename>/var/lib/shorewall/restore</filename>. The default may be
    changed using the RESTOREFILE option in <ulink
    url="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</ulink>. A
    different file name may also be specified in the <command>save</command>
    command:</para>

    <programlisting><command>shorewall save &lt;filename&gt;</command></programlisting>

    <para>Where &lt;<emphasis>filename</emphasis>&gt; is a simple file name
    (no slashes).</para>

    <para>Once created, the default restore script serves several useful
    purposes:</para>

    <itemizedlist>
      <listitem>
        <para>If you change your configuration and there is an error when you
        try to restart Shorewall, the restore script will be run to restore
        your firewall to working order.</para>
      </listitem>

      <listitem>
        <para>Bootup is faster. The -f option of the start command (e.g.,
        <command>shorewall -f start</command>) causes Shorewall to look for
        the default restore script and if it exists, the script is run. This
        is much faster than starting Shorewall using the normal mechanism of
        reading the configuration files and running
        <command>iptables</command> dozens or even hundreds of times.
        <filename>By default, /etc/init.d/shorewall</filename>
        (<filename>/etc/rc.d/rc.firewall</filename>) uses the -f option when
        it is processing a request to start Shorewall.</para>
      </listitem>

      <listitem>
        <para>The <command>shorewall restore</command> command can be used at
        any time to quickly configure the firewall.</para>

        <programlisting><command>shorewall restore [ &lt;filename&gt; ]</command></programlisting>

        <para>If no &lt;<emphasis>filename</emphasis>&gt; is given, the
        default restore script is used. Otherwise, the script
        <filename>/var/lib/shorewall/&lt;filename&gt;</filename> is
        used.</para>
      </listitem>
    </itemizedlist>

    <para>The ability to have multiple restore scripts means that you can save
    different Shorewall firewall configurations and switch between them
    quickly using the <command>restore</command> command.</para>

    <para>Restore scripts may be removed using the <command>shorewall
    forget</command> command:</para>

    <programlisting><command>shorewall forget [ &lt;filename&gt; ]</command></programlisting>

    <para>If no &lt;<emphasis>filename</emphasis>&gt; is given, the default
    restore script is removed. Otherwise,
    <filename>/var/lib/shorewall/&lt;filename&gt;</filename> is removed (of
    course, you can also use the Linux <command>rm</command> command from the
    shell prompt to remove these files).</para>
  </section>

  <section id="AddDirectories">
    <title>Additional Configuration Directories</title>

    <para>The CONFIG_PATH setting in
    <filename>/etc/shorewall/shorewall.conf</filename> determines where
    Shorewall looks for configuration files. The default setting is
    CONFIG_PATH=<filename
    class="directory">/etc/shorewall</filename>:<filename
    class="directory">/usr/share/shorewall</filename> which means that
    <filename class="directory">/etc/shorewall</filename> is searched first
    and if the file is not found then <filename
    class="directory">/usr/share/shorewall</filename> is searched. You can
    change the value of CONFIG_PATH to cause additional directories to be
    searched but CONFIG_PATH should <emphasis>always</emphasis> include both
    <filename class="directory">/etc/shorewall</filename> and <filename
    class="directory">/usr/share/shorewall</filename>.</para>

    <para>When an alternate configuration directory is specified as described
    in the <link linkend="AddDirectories">next section</link>, that directory
    is searched <emphasis>before</emphasis> those directories listed in
    CONFIG_PATH.</para>

    <para>Example - Search <filename
    class="directory">/etc/shorewall</filename>, <filename
    class="directory">/etc/shorewall/actiondir</filename> and <filename
    class="directory">/usr/share/shorewall</filename> in that order:</para>

    <programlisting>CONFIG_PATH=/etc/shorewall:/etc/shorewall/actiondir:/usr/share/shorewall</programlisting>

    <para>The above is the setting that I once used to allow me to place all
    of my user-defined 'action.' files in <filename
    class="directory">/etc/shorewall/actiondir</filename>.</para>
  </section>

  <section id="AltConfig">
    <title>Alternate Configuration Directories</title>

    <para>As explained <link linkend="AddDirectories">above</link>, Shorewall
    normally looks for configuration files in the directories specified by the
    CONFIG_PATH option in <filename
    class="directory">/etc/shorewall/shorewall.conf</filename>. The
    <command>shorewall start</command>, <command>shorewall restart</command>,
    <command>shorewall check</command>, and <command>shorewall try
    </command>commands allow you to specify an additional directory for
    Shorewall to check before looking in the directories listed in
    CONFIG_PATH.</para>

    <programlisting>     <command>shorewall {start|restart|check} &lt;configuration-directory&gt;</command>
     <command>shorewall try &lt;configuration-directory&gt; [ &lt;timeout&gt; ]</command></programlisting>

    <para>If a <emphasis>&lt;configuration-directory</emphasis>&gt; is
    specified, each time that Shorewall is going to read a file, it will first
    look in the<emphasis> &lt;configuration-directory&gt;</emphasis> . If the
    file is present in the
    <emphasis>&lt;configuration-directory&gt;,</emphasis> that file will be
    used; otherwise, the directories in the CONFIG_PATH will be searched. When
    changing the configuration of a production firewall, I recommend the
    following:</para>

    <itemizedlist>
      <listitem>
        <para>If you haven't saved the current working configuration, do so
        using <command>shorewall save</command>.</para>
      </listitem>

      <listitem>
        <para><command>mkdir /etc/test</command></para>
      </listitem>

      <listitem>
        <para><command>cd /etc/test</command></para>
      </listitem>

      <listitem>
        <para>&lt;copy any files that you need to change from /etc/shorewall
        to . and change them here&gt;</para>
      </listitem>

      <listitem>
        <para><command>shorewall check ./</command></para>
      </listitem>

      <listitem>
        <para>&lt;correct any errors found by check and check again&gt;</para>
      </listitem>

      <listitem>
        <para><command>shorewall restart ./</command></para>
      </listitem>
    </itemizedlist>

    <para>If the <command>restart</command> fails, your configuration will be
    restored to its state at the last <command>shorewall
    save</command>.</para>

    <para>When the new configuration works then just:</para>

    <itemizedlist>
      <listitem>
        <para><command>cp -f * /etc/shorewall</command></para>
      </listitem>

      <listitem>
        <para><command>cd</command></para>
      </listitem>

      <listitem>
        <para><command>rm -rf /etc/test</command></para>
      </listitem>

      <listitem>
        <para><command>shorewall save</command></para>
      </listitem>
    </itemizedlist>
  </section>

  <section>
    <title>Command Reference</title>

    <para>The general form of a command in Shorewall 3.0 is:</para>

    <blockquote>
      <para><command>shorewall [ &lt;options&gt; ] &lt;command&gt; [
      &lt;argument&gt; ... ]</command></para>

      <para>Available options are:</para>

      <variablelist>
        <varlistentry>
          <term>-c &lt;directory&gt;</term>

          <listitem>
            <para>Specifies an <link linkend="AltConfig">alternate
            configuration directory</link>.</para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term>-f</term>

          <listitem>
            <para>Specifies fast restart. See the <command>start</command>
            command below.</para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term>-n</term>

          <listitem>
            <para>Prevents the command from changing the firewall system's
            routing configuration.</para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term>-q</term>

          <listitem>
            <para>In Shorewall versions prior to 3.2.0, causes some of the
            output to be suppressed.</para>

            <para>In 3.2.0 and later, reduces the verbosity level (see
            VERBOSITY setting in <ulink
            url="Documentation.htm#Config">shorewall.conf</ulink>). May be
            repeated (e.g., "-qq") with each instance reducing the verbosity
            level by one.</para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term>-v</term>

          <listitem>
            <para>In Shorewall versions prior to 3.2.0, causes Ethernet MAC
            addresses to be included in log message displays.</para>

            <para>In 3.2.0 and later, increases the verbosity level (see
            VERBOSITY setting in <ulink
            url="Documentation.htm#Config">shorewall.conf</ulink>). May be
            repeated (e.g., "-qq") with each instance increasing the verbosity
            level by one.</para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term>-x</term>

          <listitem>
            <para>Causes all iptables -L commands to display actual packet and
            byte counts.</para>
          </listitem>
        </varlistentry>
      </variablelist>
    </blockquote>

    <para>The general form of a command in Shorewall 3.1 and later is:</para>

    <blockquote>
      <para><command>shorewall [ &lt;options&gt; ] &lt;command&gt; [
      &lt;command options&gt; ] [ &lt;argument&gt; ... ]</command></para>

      <para>For compatibility, Shorewall 3.1 and later accept all of the 3.0
      command options. In addition, 3.1 defines some new options and also
      defines command-specific options that are entered after the command on
      the run-line.</para>

      <para>New options are:</para>

      <variablelist>
        <varlistentry>
          <term>-t</term>

          <listitem>
            <para>All progress messages are timestamped with the date and
            time.</para>
          </listitem>
        </varlistentry>
      </variablelist>

      <para>In addition, the <command>-q</command> and <command>-v</command>
      options may be repeated to make the output less or more verbose
      respectively. The default level of verbosity is determined by the
      setting of the VERBOSITY option in
      <filename>/etc/shorewall/shorewall.conf</filename>.</para>

      <para>For Shorewall Lite, the general command form is:</para>

      <para><command>shorewall-lite [ &lt;options&gt; ] &lt;command&gt; [
      &lt;command options&gt; ] [ &lt;argument&gt; ... ]</command></para>

      <para>where the options are the same as with Shorewall.</para>
    </blockquote>

    <para>Following in alphabetical order are the supported commands. Except
    as noted, <filename>/sbin/shorewall-lite</filename> supports the same
    commands as <filename>/sbin/shorewall</filename>.</para>

    <variablelist>
      <varlistentry>
        <term>add (Not supported by Shorewall Lite)</term>

        <listitem>
          <para><command>shorewall add &lt;interface&gt;[:&lt;host-list&gt;] …
          &lt;zone&gt;</command></para>

          <para>A &lt;host-list&gt; is a comma-separated list whose entries
          are:</para>

          <itemizedlist>
            <listitem>
              <para>A host or network address</para>
            </listitem>

            <listitem>
              <para>The name of a bridge port</para>
            </listitem>

            <listitem>
              <para>The name of a bridge port followed by a colon (":") and a
              host or network address.</para>
            </listitem>
          </itemizedlist>

          <para>Adds an interface (and list of hosts if included) to a dynamic
          zone usually used with VPN's.</para>

          <para>Example: <command>shorewall add ipsec0:192.0.2.24
          vpn1</command></para>

          <para>adds the address 192.0.2.24 from interface ipsec0 to the zone
          vpn1.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>allow</term>

        <listitem>
          <para><command>shorewall[-lite] allow &lt;address&gt;
          ...</command></para>

          <para>Re-enables receipt of packets from hosts previously
          blacklisted by a drop or reject command.</para>

          <para>Shorewall allow, drop, rejct and save implement dynamic
          blacklisting.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>check (Not supported by Shorewall Lite)</term>

        <listitem>
          <para><command>shorewall check [ &lt;configuration-directory&gt;
          ]</command></para>

          <para>Performs a cursory validation of the zones, interfaces, hosts,
          rules, policy, masq, blacklist, proxyarp, nat and provider files.
          Use this if you are unsure of any edits you have made to the
          shorewall configuration. See <link linkend="AltConfig">above</link>
          for a recommended way to make changes.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>clear</term>

        <listitem>
          <para><command>shorewall[-lite] clear</command></para>

          <para>Clear will remove all rules and chains installed by Shorewall.
          The firewall is then wide open and unprotected. Existing connections
          are untouched. Clear is often used to see if the firewall is causing
          connection problems.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>compile (Shorewall 3.1 and later - Not supported by Shorewall
        Lite)</term>

        <listitem>
          <para><command>shorewall compile [ -e ] [ &lt;directory name&gt; ]
          &lt;path name&gt;</command></para>

          <para>Compiles the current configuration into the executable file
          &lt;path name&gt;. If &lt;path name&gt; names a file in
          /var/lib/shorewall then the file may be executed using the "restore"
          command.</para>

          <para>When -e is specified, the compilation is being performed on a
          system other than where the compiled script will run under Shorewall
          Lite. This option disables certain configuration options that
          require the script to be compiled where it is to be run and allows
          the script to be run on a system where Shorewall Lite is installed.
          The file /etc/shorewall/capabilities must be present when -e is
          used; that file specifies the iptables/kernel capabilities on the
          target system.</para>

          <para>The compiled script is a complete program that supports the
          following commands:</para>

          <blockquote>
            <simplelist>
              <member><command>&lt;program&gt; [ -q ] [ -v ] [ -n ]
              start</command></member>

              <member><command>&lt;program&gt; [ -q ] [ -v ] [ -n ]
              stop</command></member>

              <member><command>&lt;program&gt; [ -q ] [ -v ] [ -n ]
              clear</command></member>

              <member><command>&lt;program&gt; [ -q ] [ -v ] [ -n ]
              restart</command></member>

              <member><command>&lt;program&gt; [ -q ] [ -v ] [ -n ]
              status</command></member>

              <member><command>&lt;program&gt; [ -q ] [ -v ] [ -n ]
              version</command></member>
            </simplelist>
          </blockquote>

          <para>The options have their same meaning is when they are passed to
          <filename>/sbin/shorewall</filename> itself.</para>

          <para>For additional information about the
          <command>compile</command> command, see <ulink
          url="CompiledPrograms.html">this article</ulink>.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>delete (Not supported by Shorewall Lite)</term>

        <listitem>
          <para><command>shorewall delete
          &lt;interface&gt;[:&lt;host-list&gt;] …
          &lt;zone&gt;</command></para>

          <para>A &lt;host-list&gt; is a comma-separated list whose entries
          are:</para>

          <itemizedlist>
            <listitem>
              <para>A host or network address</para>
            </listitem>

            <listitem>
              <para>The name of a bridge port</para>
            </listitem>

            <listitem>
              <para>The name of a bridge port followed by a colon (":") and a
              host or network address.</para>
            </listitem>
          </itemizedlist>

          <para>Deletes the specified interface (and host list if included)
          from the specified zone.</para>

          <para>Example:</para>

          <para><command>shorewall delete ipsec0:192.0.2.24
          vpn1</command></para>

          <para>deletes the address 192.0.2.24 from interface ipsec0 from zone
          vpn1</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>drop</term>

        <listitem>
          <para><command>shorewall[-lite] drop &lt;address&gt;
          ...</command></para>

          <para>Causes packets from the specified
          &lt;<emphasis>address</emphasis>&gt; to be ignored</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>dump</term>

        <listitem>
          <para><command>shorewall[-lite] dump</command></para>

          <para>Produce a verbose report about the firewall.</para>

          <para>When -x is given, that option is also passed to iptables to
          display actual packet and byte counts.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>export (Shorewall 3.2.3 and later - Not supported by Shorewall
        Lite)</term>

        <listitem>
          <para><command>export [ &lt;directory1&gt; ]
          [&lt;user&gt;@]&lt;system&gt;:[&lt;directory2&gt;]</command></para>

          <para>If &lt;directory1&gt; is omitted, the current working
          directory is assumed.</para>

          <para>Allows a non-root user to compile a shorewall script and stage
          it on a system (provided that the user has access to the system via
          ssh). The command is equivalent to:</para>

          <simplelist>
            <member><command>/sbin/shorewall compile -e &lt;directory1&gt;
            &lt;directory1&gt;/firewall &amp;&amp;\</command></member>

            <member><command>scp &lt;directory1&gt;/firewall
            &lt;directory1&gt;/firewall.conf
            [&lt;user&gt;@]&lt;system&gt;:[&lt;directory2&gt;]</command></member>
          </simplelist>

          <para>In other words, the configuration in the specified (or
          defaulted) directory is compiled to a file called
          <filename>firewall</filename> in that directory. If compilation
          succeeds, then <filename>firewall and firewall.conf</filename> are
          copied to &lt;system&gt; using scp.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>forget</term>

        <listitem>
          <para><command>shorewall[-lite] forget [ &lt;filename&gt;
          ]</command></para>

          <para>Deletes<filename>
          /var/lib/shorewall/&lt;filename&gt;</filename>. If no
          &lt;<emphasis>filename</emphasis>&gt; is given then the file
          specified by RESTOREFILE in <ulink
          url="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</ulink>
          is removed.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>help</term>

        <listitem>
          <para><command>shorewall[-lite] help [&lt;command&gt; | host |
          address ]</command></para>

          <para>Display helpful information about the shorewall
          commands.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>hits</term>

        <listitem>
          <para><command>shorewall[-lite] hits</command></para>

          <para>Produces several reports about the Shorewall packet log
          messages in the current log file specified by the LOGFILE option in
          <ulink
          url="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</ulink>.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>ipcalc</term>

        <listitem>
          <para><command>shorewall[-lite] ipcalc { &lt;address&gt;
          &lt;mask&gt; | &lt;address&gt;/&lt;vlsm&gt; }</command></para>

          <para>Ipcalc displays the network address, broadcast address,
          network in CIDR notation and netmask corresponding to the
          input[s].</para>

          <para>Example:</para>

          <para><command>shorewall[-lite] ipcalc
          192.168.1.0/24</command></para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>iprange</term>

        <listitem>
          <para><command>shorewall[-lite] iprange
          &lt;address1&gt;-&lt;address2&gt;</command></para>

          <para>Iprange decomposes the specified range of IP addresses into
          the equivalent list of network/host addresses.</para>
        </listitem>
      </varlistentry>

      <varlistentry id="Load">
        <term>load (Added in Shorewall 3.2.0 RC4 -- not supported by Shorewall
        Lite)</term>

        <listitem>
          <para><command>load [ -s ] [ -c ] [ -r &lt;root user name&gt; ] [
          &lt;directory&gt; ] &lt;system&gt;</command></para>

          <para>If &lt;directory&gt; is omitted, the current working directory
          is assumed.</para>

          <para>Allows a non-root user to compile a shorewall script and
          install it on a system (provided that the user has root access to
          the system via ssh). The command is equivalent to:</para>

          <simplelist>
            <member><command>/sbin/shorewall compile -e &lt;directory&gt;
            &lt;directory&gt;/firewall &amp;&amp;\</command></member>

            <member><command>scp &lt;directory&gt;/firewall
            &lt;directory&gt;/firewall.conf
            root@&lt;system&gt;:/var/lib/shorewall-lite/
            &amp;&amp;\</command></member>

            <member><command>ssh root@&lt;system&gt; '/sbin/shorewall-lite
            start'</command></member>
          </simplelist>

          <para>In other words, the configuration in the specified (or
          defaulted) directory is compiled to a file called
          <filename>firewall</filename> in that directory. If compilation
          succeeds, then <filename>firewall</filename> is copied to
          &lt;system&gt; using scp. If the copy succeeds, Shorewall Lite on
          &lt;system&gt; is started via ssh.</para>

          <note>
            <para>The 'firewall' script is in <filename
            class="directory">/var/lib/shorewall-lite</filename> in packages
            from shorewall.net. The package maintainers for the various
            distributions are free to choose the directory where the script
            will be stored under their distribution by changing the value of
            LITEDIR in /usr/share/shorewall[-lite]/configpath. See the output
            of <command>shorewall[-lite] show config</command> for the value
            of LITEDIR on your distribution.</para>

            <para>Example:</para>

            <programlisting>gateway:~ # <command>shorewall-lite show config</command>
Default CONFIG_PATH is /etc/shorewall-lite:/usr/share/shorewall-lite
LITEDIR is /var/lib/shorewall-lite
gateway:~ #</programlisting>
          </note>

          <para>Example: <command>shorewall load gateway</command></para>

          <para>If the -s option (added in Shorewall 3.2.2) is given and the
          remote <command>/sbin/shorewall-lite start</command> command
          succeeds then the configuration on the remote system is saved using
          the command</para>

          <simplelist>
            <member><command>ssh root@&lt;system&gt; '/sbin/shorewall-lite
            save'</command></member>
          </simplelist>

          <para>The -c option was added in Shorewall 3.2.6. It causes the
          capabilities of the remote system to be collected and stored in a
          <filename>capabilities</filename> file in the specified (or
          defaulted) &lt;directory&gt; before the configuration is
          compiled.</para>

          <para>The -r option was added in Shoreawll 3.2.7/3.3.6 and named the
          'root' user on the remote &lt;system&gt;. This option must be used
          if the root user on &lt;system&gt; is named other than
          "root".</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>logdrop</term>

        <listitem>
          <para><command>shorewall[-lite] logdrop &lt;address&gt;
          ...</command></para>

          <para>Causes packets from the specified
          &lt;<emphasis>address</emphasis>&gt; to be ignored and logged</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>logwatch</term>

        <listitem>
          <para><command>shorewall[-lite] logwatch [ -m ] [&lt;refresh
          interval&gt;]</command></para>

          <para>Monitors the log file specified by theLOGFILE option in <ulink
          url="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</ulink>
          and produces an audible alarm when new Shorewall messages are
          logged.</para>

          <para>The '-m' option is available in Shorewall version 3.2.0 Beta5
          and later and causes the MAC address of each packet source to be
          displayed if that information is available.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>logreject</term>

        <listitem>
          <para><command>shorewall[-lite] logreject &lt;address&gt;
          ...</command></para>

          <para>Causes packets from the specified
          &lt;<emphasis>address</emphasis>&gt; to be rejected and
          logged</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>refresh (Not supported by Shorewall Lite)</term>

        <listitem>
          <para><command>shorewall refresh</command></para>

          <para>The rules involving the broadcast addresses of firewall
          interfaces, the black list and ECN control rules are recreated to
          reflect any changes made to your configuration files. Shorewall
          versions prior to 3.2.0 Beta 5 also recreate the traffic shaping
          rules as part of processing the <command>refresh</command> command.
          Existing connections are untouched. If -q is specified, less detail
          is displayed making it easier to spot warnings.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>reject</term>

        <listitem>
          <para><command>shorewall[-lite] reject &lt;address&gt;
          ...</command></para>

          <para>Causes packets from the specified
          &lt;<emphasis>address</emphasis>&gt;s to be rejected</para>
        </listitem>
      </varlistentry>

      <varlistentry id="Reload">
        <term>reload (Added in Shorewall 3.2.0 RC4 -- not supported by
        Shorewall Lite)</term>

        <listitem>
          <para><command>reload [ -s ] [ -c ] [ -r &lt;root user name&gt; ] [
          &lt;directory&gt; ] &lt;system&gt;</command></para>

          <para>If &lt;directory&gt; is omitted, the current working directory
          is assumed.</para>

          <para>Allows a non-root user to compile a shorewall script and
          install it on a system (provided that the user has root access to
          the system via ssh). The command is equivalent to:</para>

          <simplelist>
            <member><command>/sbin/shorewall compile -e &lt;directory&gt;
            &lt;directory&gt;/firewall &amp;&amp;\</command></member>

            <member><command>scp &lt;directory&gt;/firewall
            &lt;directory&gt;/firewall
            root@&lt;system&gt;:/var/lib/shorewall-lite/
            &amp;&amp;\</command></member>

            <member><command>ssh root@&lt;system&gt; '/sbin/shorewall-lite
            restart'</command></member>
          </simplelist>

          <para>In other words, the configuration in the specified (or
          defaulted) directory is compiled to a file called
          <filename>firewall</filename> in that directory. If compilation
          succeeds, then <filename>firewall</filename> is copied to
          &lt;system&gt; using scp. If the copy succeeds, Shorewall Lite on
          &lt;system&gt; is restarted via ssh.</para>

          <note>
            <para>The 'firewall' script is in <filename
            class="directory">/var/lib/shorewall-lite</filename> in packages
            from shorewall.net. The package maintainers for the various
            distributions are free to choose the directory where the script
            will be stored under their distribution by changing the value of
            LITEDIR in /usr/share/shorewall[-lite]/configpath. See the output
            of <command>shorewall[-lite] show config</command> for the value
            of LITEDIR on your distribution.</para>

            <para>Example:</para>

            <programlisting>gateway:~ # <command>shorewall-lite show config</command>
Default CONFIG_PATH is /etc/shorewall-lite:/usr/share/shorewall-lite
LITEDIR is /var/lib/shorewall-lite
gateway:~ #</programlisting>
          </note>

          <para>Example: <command>shorewall reload gateway</command></para>

          <para>If the -s option (added in Shorewall 3.2.2) is given and the
          remote <command>/sbin/shorewall-lite restart</command> command
          succeeds then the configuration on the remote system is saved using
          the command</para>

          <simplelist>
            <member><command>ssh root@&lt;system&gt; '/sbin/shorewall-lite
            save'</command></member>
          </simplelist>

          <para>The -c option was added in Shorewall 3.2.6. It causes the
          capabilities of the remote system to be collected and stored in a
          <filename>capabilities</filename> file in the specified (or
          defaulted) &lt;directory&gt; before the configuration is
          compiled.</para>

          <para>The -r option was added in Shoreawll 3.2.7/3.3.6 and named the
          'root' user on the remote &lt;system&gt;. This option must be used
          if the root user on &lt;system&gt; is named other than
          "root".</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>reset</term>

        <listitem>
          <para><command>shorewall[-lite] reset</command></para>

          <para>All the packet and byte counters in the firewall are
          reset.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>restart</term>

        <listitem>
          <para><command>shorewall[-lite] restart
          &lt;configuration-directory&gt;</command></para>

          <para>Restart is similar to <command>shorewall stop</command>
          followed by <command>shorewall start</command>. Existing connections
          are maintained. If -q is specified, less detail is displayed making
          it easier to spot warnings</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>restore</term>

        <listitem>
          <para><command>shorewall[-lite] restore [ &lt;filename&gt;
          ]</command></para>

          <para>Restore Shorewall to a state saved using the
          <command>shorewall save</command> command Existing connections are
          maintained. The &lt;<emphasis>filename</emphasis>&gt; names a
          restore file in <filename
          class="directory">/var/lib/shorewall</filename> created using
          <command>shorewall save</command>; if no
          &lt;<emphasis>filename</emphasis>&gt; is given then Shorewall will
          be restored from the file specified by the RESTOREFILE option in
          <ulink
          url="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</ulink>.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>safe-restart (Not supported by Shorewall Lite)</term>

        <listitem>
          <para><command>shorewall safe-restart [ &lt;filename&gt;
          ]</command></para>

          <para>Only allowed if Shorewall is running. The current
          configuration is saved in
          <filename>/var/lib/shorewall/safe-restart</filename> (see the
          <command>save</command> command below) that a restart is done. You
          will then be prompted asking if you want to accept the new
          configuration or not. If you answer "n" or if you fail to answer
          within 60 seconds (such as when your new configuration has disabled
          communication with your terminal), the configuration is restored
          from the saved configuration.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>safe-start (Not supported by Shorewall Lite)</term>

        <listitem>
          <para><command>shorewall safe-start [ &lt;filename&gt;
          ]</command></para>

          <para>Shorewall is started normally. You will then be prompted
          asking if everything went all right. If you answer "n" or if you
          fail to answer within 60 seconds (such as when your new
          configuration has disabled communication with your terminal), a
          <command>shorewall clear</command> is performed for you.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>save</term>

        <listitem>
          <para><command>shorewall[-lite] save [ &lt;filename&gt;
          ]</command></para>

          <para>The dynamic data is stored in /var/lib/shorewall/save. The
          state of the firewall is stored in
          <filename>/var/lib/shorewall/&lt;filename&gt;</filename> for use by
          the <command>shorewall[-lite] restore</command> and
          <command>shorewall[-lite] -f start</command> commands. If
          &lt;<emphasis>filename</emphasis>&gt; is not given then the state is
          saved in the file specified by the RESTOREFILE option in <ulink
          url="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</ulink>.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>show</term>

        <listitem>
          <para><command>shorewall show actions (Not supported by Shorewall
          Lite)</command> — produces a list of actions available on the
          system.</para>

          <para><command>shorewall[-lite] show [ &lt;chain&gt; [ &lt;chain&gt;
          ...] |classifiers|connections|log|nat|tc|tos]</command></para>

          <para><command>shorewall[-lite] show &lt;chain&gt; [ &lt;chain&gt;
          ... ] </command> - produce a verbose report about the Netfilter
          chain(s). (<command>iptables -L chain -n -v</command>)</para>

          <para><command>shorewall[-lite] show mangle</command> - produce a
          verbose report about the mangle table. (<command>iptables -t mangle
          -L -n -v</command>)</para>

          <para><command>shorewall[-lite] show nat</command> - produce a
          verbose report about the nat table. (<command>iptables -t nat -L -n
          -v</command>)</para>

          <para><command>shorewall[-lite] show [- m ] log</command> - display
          the last 20 packet log entries. The '-m' option is available in
          Shorewall version 3.2.0 Beta5 and later and causes the MAC address
          of each packet source to be displayed if that information is
          available.</para>

          <para><command>shorewall[-lite] show capabilities</command> -
          Displays your kernel/iptables capabilities</para>

          <para><command>shorewall[-lite] show connections</command> -
          displays the IP connections currently being tracked by the
          firewall.</para>

          <para><command>shorewall[-lite] show classifiers</command> -
          displays information about the traffic control/shaping
          classifiers.</para>

          <para><command>shorewall[-lite] show config</command> - displays the
          default CONFIG_PATH and LITEDIR for your distribution.</para>

          <para><command>shorewall [ -x ] show macros (Not supported by
          Shorewall Lite)</command> — produces a list of macros available on
          the system.</para>

          <para><command>shorewall[-lite] show tc</command> - displays
          information about the traffic control/shaping configuration.</para>

          <para><command>shorewall[-lite] show zones</command> — Displays the
          composition of each zone.</para>

          <para>When -x is given, that option is also passed to iptables to
          display actual packet and byte counts.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>start</term>

        <listitem>
          <para><command>shorewall[-lite] [ -f ] start [
          &lt;configuration-directory&gt; ]</command></para>

          <para>Start shorewall. Existing connections through shorewall
          managed interfaces are untouched. New connections will be allowed
          only if they are allowed by the firewall rules or policies. If -f is
          specified, the saved configuration specified by the RESTOREFILE
          option in <ulink
          url="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</ulink>
          will be restored if that saved configuration exists</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>stop</term>

        <listitem>
          <para><command>shorewall[-lite] stop</command></para>

          <para>Stops the firewall. All existing connections, except those
          listed in <filename><ulink
          url="Documentation.htm#Routestopped">/etc/shorewall/routestopped</ulink></filename>
          or permitted by the ADMINISABSENTMINDED option in <ulink
          url="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</ulink>,
          are taken down. The only new traffic permitted through the firewall
          is from systems listed in
          <filename>/etc/shorewall/routestopped</filename> or by
          ADMINISABSENTMINDED.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>status</term>

        <listitem>
          <para><command>shorewall[-lite] status</command></para>

          <para>Produce a short report about the firewall's status and state
          relative to <link linkend="State">the diagram below</link>.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>try (Not supported by Shorewall Lite)</term>

        <listitem>
          <para><command>shorewall try &lt;configuration-directory&gt; [
          &lt;timeout&gt; ]</command></para>

          <para>Restart shorewall using the specified configuration. If an
          error occurs during the restart, then another shorewall restart is
          performed using the default configuration. If a timeout is specified
          then the restart is always performed after the timeout occurs and
          uses the default configuration.</para>

          <para>When restarting using the default configuration, if the
          default restore script (as specified by the RESTOREFILE setting in
          <ulink
          url="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</ulink>)
          exists. then that script is used.</para>

          <para>The <command>try</command> command is deprecated in Shorewall
          3.0 and 3.2. A better approach to testing new configurations
          is:</para>

          <blockquote>
            <para><command>shorewall save</command></para>

            <para><command>shorewall restart
            &lt;configuration-directory&gt;</command> [ <command>&amp;&amp;
            sleep &lt;timeout&gt; &amp;&amp; shorewall restore</command>
            ]</para>

            <para><emphasis>fix problems</emphasis></para>

            <para><command>shorewall restart
            &lt;configuration-directory&gt;</command> [ <command>&amp;&amp;
            sleep &lt;timeout&gt; &amp;&amp; shorewall restore</command>
            ]</para>

            <para><emphasis>fix problems</emphasis></para>

            <para>…</para>
          </blockquote>

          <para>Beginning with Shorewall version 3.3.6, the
          <command>try</command> command has new and improved semantics as
          follows:</para>

          <blockquote>
            <para>If Shorewall is started then the firewall state is saved to
            a temporary saved configuration
            (<filename>/var/lib/shorewall/.try</filename>). Next, if Shorewall
            is currently started then a <command>restart</command> command is
            issued; otherwise, a <command>start</command> command is
            performed. if an error occurs during the compliation phase of the
            <command>restart</command> or <command>start</command>, the
            command terminates without changing the Shorewall state. If an
            error occurs during the <command>restart</command> phase, then a
            shorewall restore is performed using the saved configuration. If
            an error occurs during the <command>start</command> phase, then
            Shorewall is cleared. If the start/restart succeeds and a
            &lt;<emphasis>timeout</emphasis>&gt; is specified then a
            <command>clear</command> or <command>restore</command> is
            performed after &lt;<emphasis>timeout</emphasis>&gt;
            seconds.</para>
          </blockquote>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>version</term>

        <listitem>
          <para><command>shorewall[-lite] version</command></para>

          <para>Show the current shorewall version</para>
        </listitem>
      </varlistentry>
    </variablelist>
  </section>

  <section id="State">
    <title>Shorewall State Diagram</title>

    <para>The Shorewall State Diargram is depicted below.</para>

    <para><graphic align="center" fileref="images/State_Diagram.png" /></para>

    <informaltable>
      <tgroup cols="3">
        <thead>
          <row>
            <entry align="center">/sbin/shorewall Command</entry>

            <entry align="center">Resulting /usr/share/shorewall/firewall
            Command</entry>

            <entry align="center">Effect if the Command Succeeds</entry>
          </row>
        </thead>

        <tbody>
          <row>
            <entry>shorewall start</entry>

            <entry>firewall start</entry>

            <entry>The system filters packets based on your current Shorewall
            Configuration</entry>
          </row>

          <row>
            <entry>shorewall stop</entry>

            <entry>firewall stop</entry>

            <entry>Only traffic to/from hosts listed in /etc/shorewall/hosts
            is passed to/from/through the firewall. If ADMINISABSENTMINDED=Yes
            in /etc/shorewall/shorewall.conf then in addition, all existing
            connections are retained and all connection requests from the
            firewall are accepted.</entry>
          </row>

          <row>
            <entry>shorewall restart</entry>

            <entry>firewall restart</entry>

            <entry>Logically equivalent to <quote>firewall stop;firewall
            start</quote></entry>
          </row>

          <row>
            <entry>shorewall add</entry>

            <entry>firewall add</entry>

            <entry>Adds a host or subnet to a dynamic zone</entry>
          </row>

          <row>
            <entry>shorewall delete</entry>

            <entry>firewall delete</entry>

            <entry>Deletes a host or subnet from a dynamic zone</entry>
          </row>

          <row>
            <entry>shorewall refresh</entry>

            <entry>firewall refresh</entry>

            <entry>Reloads rules dealing with static blacklisting, traffic
            control and ECN.</entry>
          </row>

          <row>
            <entry>shorewall reset</entry>

            <entry>firewall reset</entry>

            <entry>Resets traffic counters</entry>
          </row>

          <row>
            <entry>shorewall clear</entry>

            <entry>firewall clear</entry>

            <entry>Removes all Shorewall rules, chains, addresses, routes and
            ARP entries.</entry>
          </row>

          <row>
            <entry>shorewall try</entry>

            <entry>firewall -c &lt;new configuration&gt; restart If
            unsuccessful then firewall start (standard configuration) If
            timeout then firewall restart (standard configuration)</entry>

            <entry></entry>
          </row>
        </tbody>
      </tgroup>
    </informaltable>

    <para>The only time that a program other than
    <command>/usr/share/shorewall[-lite[/firewall</command> performs a state
    transition itself is when the <command>shorewall[-lite] restore</command>
    command is executed. In that case, the
    <command>/var/lib/shorewall[-lite]/restore</command> program sets the
    state to "Started".</para>

    <section>
      <title>Notes for Shorewall 3.2.0 and Later</title>

      <para>With any command that involves compilation, there is no state
      transition while the compiler is running. If compilation fails, the
      state remains unchanged.</para>

      <para>Also, <command>shorewall start</command> and <command>shorewall
      restart</command> involve compilation followed by execution of the
      compiled script. So it is the compiled script that performs the state
      transition in these commands rather than
      <command>/usr/share/shorewall/firewall</command>.</para>

      <para>The compiled script is placed in <filename
      class="directory">/var/lib/shorewall</filename> and is named either
      <filename>.start</filename> or <filename>.restart</filename> depending
      on the command.</para>
    </section>
  </section>
</article>