shorewall_code/manpages/shorewall-netmap.xml

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

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

  <refnamediv>
    <refname>netmap</refname>

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

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>/etc/shorewall/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.</para>

    <variablelist>
      <varlistentry>
        <term><emphasis role="bold">TYPE</emphasis> - <emphasis
        role="bold">{DNAT</emphasis>|<emphasis
        role="bold">SNAT}[:{P|O|T}</emphasis>]</term>

        <listitem>
          <para>Must be DNAT or SNAT; beginning with Shorewall 4.4.23, may be
          optionally followed by :P, :O or :T to perform <firstterm>stateless
          NAT</firstterm>. Stateless NAT requires <firstterm>Rawpost Table
          support</firstterm> in your kernel and iptables (see the output of
          <command>shorewall show capabilities</command>).</para>

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

          <para>If SNAT or SNAT:T, traffic leaving INTERFACE with a source
          address in NET1 has it's source address rewritten to the
          corresponding address in NET2.</para>

          <para>If DNAT:O, traffic originating on the firewall and leaving via
          INTERFACE and addressed to NET1 has its destination address
          rewritten to the corresponding address in NET2.</para>

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

          <para>If SNAT:P, traffic entering via INTERFACE with a destination
          address in NET1 has it's source address rewritten to the
          corresponding address in NET2.</para>

          <para>If SNAT:O, traffic originating on the firewall and leaving via
          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).</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 DESTINATON
          network for SNAT rules.</para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>FILES</title>

    <para>/etc/shorewall/netmap</para>
  </refsect1>

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

    <para><ulink
    url="http://shorewall.net/netmap.html">http://shorewall.net/netmap.html</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-params(5), shorewall-policy(5),
    shorewall-providers(5), shorewall-proxyarp(5), shorewall-route_rules(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>