<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd"> <refentry> <refmeta> <refentrytitle>shorewall6-hosts</refentrytitle> <manvolnum>5</manvolnum> <refmiscinfo>Configuration Files</refmiscinfo> </refmeta> <refnamediv> <refname>hosts</refname> <refpurpose>shorewall6 file</refpurpose> </refnamediv> <refsynopsisdiv> <cmdsynopsis> <command>/etc/shorewall6/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 declared in <ulink url="/manpages6/shorewall6-zones.html">shorewall6-zones</ulink>(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 <ulink url="/manpages6/shorewall6-interfaces.html">shorewall6-interfaces</ulink>(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 (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">ZONE</emphasis> - <emphasis>zone-name</emphasis></term> <listitem> <para>The name of a zone declared in <ulink url="/manpages6/shorewall6-zones.html">shorewall6-zones</ulink>(5). You may not list the firewall zone in this column.</para> </listitem> </varlistentry> <varlistentry> <term><emphasis role="bold">HOST(S)</emphasis> (hosts)- <emphasis>interface</emphasis>:{<replaceable>address-or-range</replaceable>[,<replaceable>address-or-range</replaceable>]...|+<replaceable>ipset</replaceable>|<option>dynamic</option>}[<replaceable>exclusion</replaceable>]</term> <listitem> <para>The name of an interface defined in the <ulink url="/manpages6/shorewall6-interfaces.html">shorewall6-interfaces</ulink>(5) file followed by a colon (":") and a comma-separated list whose elements are either:</para> <orderedlist numeration="loweralpha"> <listitem> <para>The IPv6 <replaceable>address</replaceable> 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 ip6tables must have iprange match support.</para> </listitem> <listitem> <para>The name of an <emphasis>ipset</emphasis>.</para> </listitem> <listitem> <para>The word <option>dynamic</option> which makes the zone dynamic in that you can use the <command>shorewall add</command> and <command>shorewall delete</command> commands to change to composition of the zone. This capability was added in Shorewall 4.4.21.</para> </listitem> </orderedlist> <blockquote> <para>You may also exclude certain hosts through use of an <emphasis>exclusion</emphasis> (see <ulink url="/manpages6/shorewall6-exclusion.html">shorewall6-exclusion</ulink>(5).</para> </blockquote> </listitem> </varlistentry> <varlistentry> <term>OPTIONS - [<emphasis>option</emphasis>[<emphasis role="bold">,</emphasis><emphasis>option</emphasis>]...]</term> <listitem> <para>An optional comma-separated list of options from the following list. The order in which you list the options is not significant but the list must have no embedded white-space.</para> <variablelist> <varlistentry> <term><emphasis role="bold">blacklist</emphasis></term> <listitem> <para>Check packets arriving on this port against the <ulink url="/manpages6/shorewall6-blacklist.html">shorewall6-blacklist</ulink>(5) file.</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 <ulink url="/manpages6/shorewall6-zones.html">shorewall6-zones</ulink>(5) file then you do NOT need to specify the 'ipsec' option here.</para> </listitem> </varlistentry> <varlistentry> <term><emphasis role="bold">mss</emphasis>=<replaceable>mss</replaceable></term> <listitem> <para>Added in Shorewall 4.5.2. When present, causes the TCP mss for new connections to/from the hosts given in the HOST(S) column to be clamped at the specified <replaceable>mss</replaceable>.</para> </listitem> </varlistentry> <varlistentry> <term><emphasis role="bold">routeback</emphasis></term> <listitem> <para>shorewall6 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">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> </variablelist> </listitem> </varlistentry> </variablelist> </refsect1> <refsect1> <title>FILES</title> <para>/etc/shorewall6/hosts</para> </refsect1> <refsect1> <title>See ALSO</title> <para><ulink url="/configuration_file_basics.htm#Pairs">http://www.shorewall.net/configuration_file_basics.htm#Pairs</ulink></para> <para>shorewall6(8), shorewall6-accounting(5), shorewall6-actions(5), shorewall6-blacklist(5), shorewall6-interfaces(5), shorewall6-maclist(5), shorewall6-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-tcclasses(5), shorewall6-tcdevices(5), shorewall6-mangle(5), shorewall6-tos(5), shorewall6-tunnels(5), shorewall-zones(5)</para> </refsect1> </refentry>