shorewall_code/Shorewall/manpages/shorewall-netmap.xml

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

    <manvolnum>5</manvolnum>

    <refmiscinfo>Configuration Files</refmiscinfo>
  </refmeta>

  <refnamediv>
    <refname>netmap</refname>

    <refpurpose>Shorewall NETMAP definition file</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>/etc/shorewall[6]/netmap</command>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>This file is used to map addresses in one network to corresponding
    addresses in a second network.</para>

    <warning>
      <para>To use this file, your kernel and iptables must have NETMAP
      support included.</para>
    </warning>

    <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">TYPE</emphasis> - <emphasis
        role="bold">{DNAT</emphasis>|<emphasis
        role="bold">SNAT}</emphasis></term>

        <listitem>
          <para>If DNAT, traffic entering INTERFACE and addressed to NET1 has
          its destination address rewritten to the corresponding address in
          NET2.</para>

          <para>If SNAT, traffic leaving INTERFACE with a source address in
          NET1 has it's source address rewritten to the corresponding address
          in NET2.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">NET1</emphasis> -
        <emphasis>network-address</emphasis></term>

        <listitem>
          <para>Network in CIDR format (e.g., 192.168.1.0/24). Beginning with
          Shorewall 4.4.24, <ulink
          url="shorewall-exclusion.html">exclusion</ulink> is
          supported.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">INTERFACE</emphasis> -
        <emphasis>interface</emphasis></term>

        <listitem>
          <para>The name of a network interface. The interface must be defined
          in <ulink
          url="shorewall-interfaces.html">shorewall-interfaces</ulink>(5).
          Shorewall allows loose matches to wildcard entries in <ulink
          url="shorewall-interfaces.html">shorewall-interfaces</ulink>(5).
          For example, <filename class="devicefile">ppp0</filename> in this
          file will match a <ulink
          url="shorewall-interfaces.html">shorewall-interfaces</ulink>(8)
          entry that defines <filename
          class="devicefile">ppp+</filename>.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">NET2</emphasis> -
        <emphasis>network-address</emphasis></term>

        <listitem>
          <para>Network in CIDR format</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">NET3 (Optional)</emphasis> -
        <emphasis>network-address</emphasis></term>

        <listitem>
          <para>Added in Shorewall 4.4.11. If specified, qualifies INTERFACE.
          It specifies a SOURCE network for DNAT rules and a DESTINATION
          network for SNAT rules.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">PROTO</emphasis> -
        <emphasis>protocol-number-or-name</emphasis></term>

        <listitem>
          <para>Optional -- added in Shorewall 4.4.23.2. Only packets
          specifying this protocol will have their IP header modified.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">DPORT</emphasis> -
        <emphasis>port-number-or-name-list</emphasis></term>

        <listitem>
          <para>Optional - added in Shorewall 4.4.23.2. Destination Ports. A
          comma-separated list of Port names (from services(5)),
          <emphasis>port number</emphasis>s or <emphasis>port
          range</emphasis>s; if the protocol is <emphasis
          role="bold">icmp</emphasis>, this column is interpreted as the
          destination icmp-type(s). ICMP types may be specified as a numeric
          type, a numeric type and code separated by a slash (e.g., 3/4), or a
          typename. See <ulink
          url="../configuration_file_basics.htm#ICMP">https://shorewall.org/configuration_file_basics.htm#ICMP</ulink>.</para>

          <para>If the protocol is <emphasis role="bold">ipp2p</emphasis>,
          this column is interpreted as an ipp2p option without the leading
          "--" (example <emphasis role="bold">bit</emphasis> for bit-torrent).
          If no PORT is given, <emphasis role="bold">ipp2p</emphasis> is
          assumed.</para>

          <para>An entry in this field requires that the PROTO column specify
          icmp (1), tcp (6), udp (17), sctp (132) or udplite (136). Use '-' if
          any of the following field is supplied.</para>

          <para>This column was formerly labelled DEST PORT(S).</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">SPORT</emphasis> -
        <emphasis>port-number-or-name-list</emphasis></term>

        <listitem>
          <para>Optional -- added in Shorewall 4.4.23.2. Source port(s). If
          omitted, any source port is acceptable. Specified as a
          comma-separated list of port names, port numbers or port
          ranges.</para>

          <para>An entry in this field requires that the PROTO column specify
          tcp (6), udp (17), sctp (132) or udplite (136). Use '-' if any of
          the following fields is supplied.</para>

          <para>This column was formerly labelled SOURCE PORT(S).</para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>FILES</title>

    <para>/etc/shorewall/netmap</para>

    <para>/etc/shorewall6/netmap</para>
  </refsect1>

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

    <para><ulink
    url="../netmap.html">https://shorewall.org/netmap.html</ulink></para>

    <para><ulink
    url="../configuration_file_basics.htm#Pairs">https://shorewall.org/configuration_file_basics.htm#Pairs</ulink></para>

    <para>shorewall(8)</para>
  </refsect1>
</refentry>