shorewall_code/manpages/shorewall-rtrules.xml

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<refentry>
  <refmeta>
    <refentrytitle>shorewall-rtrules</refentrytitle>

    <manvolnum>5</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>rtrules</refname>

    <refpurpose>Shorewall Routing Rules file</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>/etc/shorewall/rtrules</command>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>Entries in this file cause traffic to be routed to one of the
    providers listed in <ulink
    url="shorewall-providers.html">shorewall-providers</ulink>(5).</para>

    <para>The columns in the file are as follows.</para>

    <variablelist>
      <varlistentry>
        <term><emphasis role="bold">SOURCE</emphasis> (Optional) - {<emphasis
        role="bold">-</emphasis>|[&amp;]<emphasis>interface</emphasis>|<emphasis>address</emphasis>|<emphasis>interface</emphasis><firstterm>:</firstterm><emphasis>address</emphasis>}</term>

        <listitem>
          <para>An ip <emphasis>address</emphasis> (network or host) that
          matches the source IP address in a packet. May also be specified as
          an <emphasis>interface</emphasis> name optionally followed by ":"
          and an address. If the device <emphasis role="bold">lo</emphasis> is
          specified, the packet must originate from the firewall
          itself.</para>

          <para>Beginning with Shorewall 4.5.0, you may specify
          &amp;<replaceable>interface</replaceable> in this column to indicate
          that the source is the primary IP address of the named
          interface.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">DEST</emphasis> (Optional) - {<emphasis
        role="bold">-</emphasis>|<emphasis>address</emphasis>}</term>

        <listitem>
          <para>An ip address (network or host) that matches the destination
          IP address in a packet.</para>

          <para>If you choose to omit either <emphasis
          role="bold">SOURCE</emphasis> or <emphasis
          role="bold">DEST</emphasis>, place "-" in that column. Note that you
          may not omit both <emphasis role="bold">SOURCE</emphasis> and
          <emphasis role="bold">DEST</emphasis>.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">PROVIDER</emphasis> -
        {<emphasis>provider-name</emphasis>|<emphasis>provider-number</emphasis>|<emphasis
        role="bold">main</emphasis>}</term>

        <listitem>
          <para>The provider to route the traffic through. May be expressed
          either as the provider name or the provider number. May also be
          <emphasis role="bold">main</emphasis> or 254 for the main routing
          table. This can be used in combination with VPN tunnels, see example
          2 below.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">PRIORITY</emphasis> -
        <emphasis>priority</emphasis></term>

        <listitem>
          <para>The rule's numeric <emphasis>priority</emphasis> which
          determines the order in which the rules are processed. Rules with
          equal priority are applied in the order in which they appear in the
          file.</para>

          <variablelist>
            <varlistentry>
              <term>1000-1999</term>

              <listitem>
                <para>Before Shorewall-generated 'MARK' rules</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term>11000-11999</term>

              <listitem>
                <para>After 'MARK' rules but before Shorewall-generated rules
                for ISP interfaces.</para>
              </listitem>
            </varlistentry>

            <varlistentry>
              <term>26000-26999</term>

              <listitem>
                <para>After ISP interface rules but before 'default'
                rule.</para>
              </listitem>
            </varlistentry>
          </variablelist>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">MARK -
        {-|<replaceable>mark</replaceable>[/<replaceable>mask</replaceable>]}</emphasis></term>

        <listitem>
          <para>Optional -- added in Shorewall 4.4.25. For this rule to be
          applied to a packet, the packet's mark value must match the
          <replaceable>mark</replaceable> when logically anded with the
          <replaceable>mask</replaceable>. If a
          <replaceable>mask</replaceable> is not supplied, Shorewall supplies
          a suitable provider mask.</para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>Examples</title>

    <variablelist>
      <varlistentry>
        <term>Example 1:</term>

        <listitem>
          <para>You want all traffic coming in on eth1 to be routed to the
          ISP1 provider.</para>

          <programlisting>        #SOURCE                 DEST            PROVIDER        PRIORITY      MASK
        eth1                    -               ISP1            1000
</programlisting>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>Example 2:</term>

        <listitem>
          <para>You use OpenVPN (routed setup /tunX) in combination with
          multiple providers. In this case you have to set up a rule to ensure
          that the OpenVPN traffic is routed back through the tunX
          interface(s) rather than through any of the providers. 10.8.0.0/24
          is the subnet chosen in your OpenVPN configuration (server 10.8.0.0
          255.255.255.0).</para>

          <programlisting>         #SOURCE                 DEST            PROVIDER        PRIORITY     MASK
         -                       10.8.0.0/24     main            1000
</programlisting>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>FILES</title>

    <para>/etc/shorewall/rtrules</para>
  </refsect1>

  <refsect1>
    <title>See ALSO</title>

    <para><ulink
    url="http://shorewall.net/MultiISP.html">http://shorewall.net/MultiISP.html</ulink></para>

    <para><ulink
    url="http://shorewall.net/configuration_file_basics.htm#Pairs">http://shorewall.net/configuration_file_basics.htm#Pairs</ulink></para>

    <para>shorewall(8), shorewall-accounting(5), shorewall-actions(5),
    shorewall-blacklist(5), shorewall-hosts(5), shorewall_interfaces(5),
    shorewall-ipsets(5), shorewall-maclist(5), shorewall-masq(5),
    shorewall-nat(5), shorewall-netmap(5), shorewall-params(5),
    shorewall-policy(5), shorewall-providers(5), shorewall-proxyarp(5),
    shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5),
    shorewall-secmarks(5), shorewall-tcclasses(5), shorewall-tcdevices(5),
    shorewall-tcrules(5), shorewall-tos(5), shorewall-tunnels(5),
    shorewall-zones(5)</para>
  </refsect1>
</refentry>