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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 (where the column name is
    followed by a different name in parentheses, the different name is used in
    the alternate specification syntax).</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><emphasis role="bold">IN-BANDWIDTH (in_bandwidth)</emphasis> -
        {-|<replaceable>bandwidth</replaceable>[:<replaceable>burst</replaceable>]|~<replaceable>bandwidth</replaceable>[:<replaceable>interval</replaceable>:<replaceable>decay_interval</replaceable>]}</term>

        <listitem>
          <para>The incoming <emphasis>bandwidth</emphasis> of that interface.
          Please note that you are not able to do traffic shaping on incoming
          traffic, as the traffic is already received before you could do so.
          But this allows you to define the maximum traffic allowed for this
          interface in total, if the rate is exceeded, the packets are
          dropped. You want this mainly if you have a DSL or Cable connection
          to avoid queuing at your providers side.</para>

          <para>If you don't want any traffic to be dropped, set this to a
          value to zero in which case Shorewall will not create an ingress
          qdisc.Must be set to zero if the REDIRECTED INTERFACES column is
          non-empty.</para>

          <para>The optional burst option was added in Shorewall 4.4.18. The
          default <replaceable>burst</replaceable> is 10kb. A larger
          <replaceable>burst</replaceable> can help make the
          <replaceable>bandwidth</replaceable> more accurate; often for fast
          lines, the enforced rate is well below the specified
          <replaceable>bandwidth</replaceable>.</para>

          <para>What is described above creates a rate/burst policing filter.
          Beginning with Shorewall 4.4.25, a rate-estimated policing filter
          may be configured instead. Rate-estimated filters should be used
          with ethernet adapters that have Generic Receive Offload enabled by
          default. See <ulink
          url="http://www.shorewall.net/FAQ.htm#faq97a">Shorewall FAQ
          97a</ulink>.</para>

          <para>To create a rate-estimated filter, precede the bandwidth with
          a tilde ("~"). The optional interval and decay_interval determine
          how often the rate is estimated and how many samples are retained
          for estimating. Please see <ulink
          url="http://ace-host.stuart.id.au/russell/files/tc/doc/estimators.txt">http://ace-host.stuart.id.au/russell/files/tc/doc/estimators.txt</ulink>
          for details.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>OUT-BANDWIDTH (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><ulink
    url="http://ace-host.stuart.id.au/russell/files/tc/doc/estimators.txt">http://ace-host.stuart.id.au/russell/files/tc/doc/estimators.txt</ulink></para>

    <para>shorewall6(8), shorewall6-accounting(5), shorewall6-actions(5),
    shorewall6-blacklist(5), shorewall6-hosts(5), shorewall6-maclist(5),
    shoewall6-netmap(5),shorewall6-params(5), shorewall6-policy(5),
    shorewall6-providers(5), shorewall6-rtrules(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>
