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<refentry>
  <refmeta>
    <refentrytitle>shorewall6-tcinterfaces</refentrytitle>

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

  <refnamediv>
    <refname>tcinterfaces</refname>

    <refpurpose>Shorewall6 file</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>/etc/shorewall6/tcinterfaces</command>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>This file lists the interfaces that are subject to simple traffic
    shaping. Simple traffic shaping is enabled by setting TC_ENABLED=Simple in
    <ulink url="shorewall6.conf.html">shorewall6.conf</ulink>(5).</para>

    <para>A note on the <emphasis>bandwidth</emphasis> definition used in this
    file:</para>

    <itemizedlist>
      <listitem>
        <para>don't use a space between the integer value and the unit: 30kbit
        is valid while 30 kbit is not.</para>
      </listitem>

      <listitem>
        <para>you can use one of the following units:</para>

        <variablelist>
          <varlistentry>
            <term><emphasis role="bold">kbps</emphasis></term>

            <listitem>
              <para>Kilobytes per second.</para>
            </listitem>
          </varlistentry>

          <varlistentry>
            <term><emphasis role="bold">mbps</emphasis></term>

            <listitem>
              <para>Megabytes per second.</para>
            </listitem>
          </varlistentry>

          <varlistentry>
            <term><emphasis role="bold">kbit</emphasis></term>

            <listitem>
              <para>Kilobits per second.</para>
            </listitem>
          </varlistentry>

          <varlistentry>
            <term><emphasis role="bold">mbit</emphasis></term>

            <listitem>
              <para>Megabits per second.</para>
            </listitem>
          </varlistentry>

          <varlistentry>
            <term><emphasis role="bold">bps</emphasis> or <emphasis
            role="bold">number</emphasis></term>

            <listitem>
              <para>Bytes per second.</para>
            </listitem>
          </varlistentry>

          <varlistentry>
            <term>k or kb</term>

            <listitem>
              <para>Kilo bytes.</para>
            </listitem>
          </varlistentry>

          <varlistentry>
            <term>m or mb</term>

            <listitem>
              <para>Megabytes.</para>
            </listitem>
          </varlistentry>
        </variablelist>
      </listitem>

      <listitem>
        <para>Only whole integers are allowed.</para>
      </listitem>
    </itemizedlist>

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

    <variablelist>
      <varlistentry>
        <term><emphasis role="bold">INTERFACE</emphasis></term>

        <listitem>
          <para>The logical name of an interface. If you run both IPv4 and
          IPv6 Shorewall firewalls, a given interface should only be listed in
          one of the two configurations.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">TYPE</emphasis> - [<emphasis
        role="bold">external</emphasis>|<emphasis
        role="bold">internal</emphasis>]</term>

        <listitem>
          <para>Optional. If given specifies whether the interface is
          <emphasis role="bold">external</emphasis> (facing toward the
          Internet) or <emphasis role="bold">internal</emphasis> (facing
          toward a local network) and enables SFQ flow classification.</para>

          <note>
            <para>Simple traffic shaping is only useful on interfaces where
            queuing occurs. As a consequence, internal interfaces seldom
            benefit from simple traffic shaping. VPN interfaces are an
            exception because the encapsulated packets are later transferred
            over a slower external link.</para>
          </note>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>IN-BANDWIDTH -
        [<replaceable>rate</replaceable>[:<replaceable>burst</replaceable>]]</term>

        <listitem>
          <para>Optional. If specified, enables ingress policing on the
          interface. If incoming traffic exceeds the given
          <replaceable>rate</replaceable>, received packets are dropped
          randomly. With some DSL and Cable links, large queues can build up
          in the ISP's gateway router. While this insures maximum throughput,
          it kills interactive response time. By setting IN-BANDWIDTH, you can
          eliminate these queues.</para>

          <para>To pick an appropriate setting, we recommend that you start by
          setting it significantly below your measured download bandwidth (20%
          or so). While downloading, measure the ping response time from the
          firewall to the upstream router as you gradually increase the
          setting.The optimal setting is at the point beyond which the ping
          time increases sharply as you increase the setting.</para>

          <para>The <replaceable>burst</replaceable> option was added in
          Shorewall 4.4.13. If not supplied, 10kb is assumed. A larger
          <replaceable>burst</replaceable> size can help make the
          <replaceable>rate</replaceable> estimate more accurate on fast
          lines. The default <replaceable>burst</replaceable> often make the
          enforced rate mush less that the specified
          <replaceable>rate</replaceable>.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>OUT-BANDWIDTH -
        [<replaceable>rate</replaceable>[:[<replaceable>burst</replaceable>][:[<replaceable>latency</replaceable>][:[<replaceable>peek</replaceable>][:[<replaceable>minburst</replaceable>]]]]]]</term>

        <listitem>
          <para>Added in Shorewall 4.4.13. The terms are defined in
          tc-tbf(8).</para>

          <para>Shorewall provides defaults as follows:</para>

          <simplelist>
            <member><replaceable>burst</replaceable> - 10kb</member>

            <member><replaceable>latency</replaceable> - 200ms</member>
          </simplelist>

          <para>The remaining options are defaulted by tc(8).</para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>FILES</title>

    <para>/etc/shorewall6/tcinterfaces.</para>
  </refsect1>

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

    <para><ulink
    url="http://ace-host.stuart.id.au/russell/files/tc/doc/sch_tbf.txt">http://ace-host.stuart.id.au/russell/files/tc/doc/sch_tbf.txt</ulink></para>

    <para>shorewall6(8), shorewall6-accounting(5), shorewall6-actions(5),
    shorewall6-blacklist(5), shorewall6-hosts(5), shorewall6-maclist(5),
    shorewall6-params(5), shorewall6-policy(5), shorewall6-providers(5),
    shorewall6-route_rules(5), shorewall6-routestopped(5),
    shorewall6-rules(5), shorewall6.conf(5), shorewall6-secmarks(5),
    shorewall6-tcpri, shorewall6-tos(5), shorewall6-tunnels(5),
    shorewall6-zones(5)</para>
  </refsect1>
</refentry>
