shorewall_code/manpages/shorewall-hosts.xml

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

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

  <refnamediv>
    <refname>hosts</refname>

    <refpurpose>Shorewall file</refpurpose>
  </refnamediv>

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

  <refsect1>
    <title>Description</title>

    <para>This file is used to define zones in terms of subnets and/or
    individual IP addresses. Most simple setups don't need to (should not)
    place anything in this file.</para>

    <para>The order of entries in this file is not significant in determining
    zone composition. Rather, the order that the zones are defined in
    shorewall-zones(5) determines the order in which the records in this file
    are interpreted.</para>

    <warning>
      <para>The only time that you need this file is when you have more than
      one zone connected through a single interface.</para>
    </warning>

    <warning>
      <para>If you have an entry for a zone and interface in
      shorewall-interfaces(5) then do not include any entries in this file for
      that same (zone, interface) pair.</para>
    </warning>

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

    <variablelist>
      <varlistentry>
        <term><emphasis role="bold">ZONE</emphasis> —
        <emphasis>zone-name</emphasis></term>

        <listitem>
          <para>The name of a zone defined in shorewall-zones(5). You may not
          list the firewall zone in this column.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><emphasis role="bold">HOST(S)</emphasis> —
        <emphasis>interface</emphasis>:{[<emphasis>port</emphasis>:]{<emphasis>address-or-range</emphasis>[<emphasis
        role="bold">,</emphasis><emphasis>address-or-range</emphasis>]...|<emphasis
        role="bold">+</emphasis><emphasis>ipset</emphasis>}</term>

        <listitem>
          <para>The name of an interface defined in the
          shorewall-interfaces(5) file followed by a colon (":") and a
          comma-separated list whose elements are either:</para>

          <orderedlist numeration="loweralpha">
            <listitem>
              <para>The IP address of a host.</para>
            </listitem>

            <listitem>
              <para>A network in CIDR format.</para>
            </listitem>

            <listitem>
              <para>An IP address range of the form
              <emphasis>low.address</emphasis>-<emphasis>high.address</emphasis>.
              Your kernel and iptables must have iprange match support.</para>
            </listitem>

            <listitem>
              <para>A physical <emphasis>port</emphasis> name; only allowed
              when the interface names a bridge created by the
              <command>brctl(8) addbr</command> command. This port must not be
              defined in shorewall-interfaces(5) and may be optionally
              followed by a colon (":") and a host or network IP or a range.
              See <ulink
              url="http://www.shorewall.net/bridge.html">http://www.shorewall.net/bridge.html</ulink>
              for details. Specifying a physical port name requires that you
              have BRIDGING=Yes in shorewall.conf(5).</para>
            </listitem>

            <listitem>
              <para>The name of an <emphasis>ipset</emphasis>.</para>
            </listitem>
          </orderedlist>

          <para>Examples:</para>

          <simplelist>
            <member>eth1:192.168.1.3</member>

            <member>eth2:192.168.2.0/24</member>

            <member>eth3:192.168.2.0/24,192.168.3.1</member>

            <member>br0:eth4</member>

            <member>br0:eth0:192.168.1.16/28</member>

            <member>eth4:192.168.1.44-192.168.1.49</member>

            <member>eth2:+Admin</member>
          </simplelist>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>OPTIONS — [<emphasis>option</emphasis>[<emphasis
        role="bold">,</emphasis><emphasis>option</emphasis>]...]</term>

        <listitem>
          <para>A comma-separated list of options from the following list. The
          order in which you list the options is not significant but the list
          should have no embedded white space.</para>

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

              <listitem>
                <para>Connection requests from these hosts are compared
                against the contents of shorewall-maclist(5). If this option
                is specified, the interface must be an ethernet NIC or
                equivalent and must be up before Shorewall is started.</para>
              </listitem>
            </varlistentry>

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

              <listitem>
                <para>Shorewall should set up the infrastructure to pass
                packets from this/these address(es) back to themselves. This
                is necessary if hosts in this group use the services of a
                transparent proxy that is a member of the group or if DNAT is
                used to send requests originating from this group to a server
                in the group.</para>
              </listitem>
            </varlistentry>

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

              <listitem>
                <para>This option only makes sense for ports on a
                bridge.</para>

                <para>Check packets arriving on this port against the
                shorewall-blacklist(5) file.</para>
              </listitem>
            </varlistentry>

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

              <listitem>
                <para>Packets arriving from these hosts are checked for
                certain illegal combinations of TCP flags. Packets found to
                have such a combination of flags are handled according to the
                setting of TCP_FLAGS_DISPOSITION after having been logged
                according to the setting of TCP_FLAGS_LOG_LEVEL.</para>
              </listitem>
            </varlistentry>

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

              <listitem>
                <para>This option only makes sense for ports on a
                bridge.</para>

                <para>Filter packets for smurfs (packets with a broadcast
                address as the source).</para>

                <para>Smurfs will be optionally logged based on the setting of
                SMURF_LOG_LEVEL in shorewall.conf(5). After logging, the
                packets are dropped.</para>
              </listitem>
            </varlistentry>

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

              <listitem>
                <para>The zone is accessed via a kernel 2.6 ipsec SA. Note
                that if the zone named in the ZONE column is specified as an
                IPSEC zone in the shorewall-zones(5) file then you do NOT need
                to specify the 'ipsec' option here.</para>
              </listitem>
            </varlistentry>
          </variablelist>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>FILES</title>

    <para>/etc/shorewall/hosts</para>
  </refsect1>

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

    <para><ulink
    url="http://www.shorewall.net/Documentation.htm#Hosts">http://www.shorewall.net/Documentation.htm#Hosts</ulink></para>

    <para>shorewall(8), shorewall-accounting(5), shorewall-actions(5),
    shorewall-blacklist(5), shorewall-interfaces(5), shorewall-ipsec(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-route_routes(5),
    shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5),
    shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5),
    shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5)</para>
  </refsect1>
</refentry>