mirror of
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1a29390418
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@4980 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
133 lines
4.7 KiB
XML
133 lines
4.7 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<refentry>
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<refmeta>
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<refentrytitle>shorewall-nat</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>nat</refname>
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<refpurpose>Shorewall one-to-one NAT file</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>/etc/shorewall/nat</command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>This file is used to define one-to-one Network Address Translation
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(NAT).</para>
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<warning>
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<para>If all you want to do is simple port forwarding, do NOT use this
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file. See http://www.shorewall.net/FAQ.htm#faq1. Also, in most cases,
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Proxy ARP is a better solution that one-to-one NAT.</para>
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</warning>
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<para>The columns in the file are as follows.</para>
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<variablelist>
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<varlistentry>
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<term><emphasis role="bold">EXTERNAL</emphasis> —
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<emphasis>address</emphasis></term>
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<listitem>
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<para>External IP Address - this should NOT be the primary IP
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address of the interface named in the next column and must not be a
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DNS Name.</para>
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<para>If you put COMMENT in this column, the rest of the line will
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be attached as a comment to the Netfilter rule(s) generated by the
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following entries in the file. The comment will appear delimited by
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"/* ... */" in the output of "shorewall show nat"</para>
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<para>To stop the comment from being attached to further rules,
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simply include COMMENT on a line by itself.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">INTERFACE</emphasis> —
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<emphasis>interface</emphasis>[<emphasis
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role="bold">:</emphasis>[<emphasis>digit</emphasis>]]</term>
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<listitem>
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<para>Interface that has the <emphasis
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role="bold">EXTERNAL</emphasis> address. If ADD_IP_ALIASES=Yes in
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shorewall.conf(5), Shorewall will automatically add the EXTERNAL
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address to this interface. Also if ADD_IP_ALIASES=Yes, you may
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follow the interface name with ":" and a <emphasis>digit</emphasis>
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to indicate that you want Shorewall to add the alias with this name
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(e.g., "eth0:0"). That allows you to see the alias with ifconfig.
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<emphasis role="bold">That is the only thing that this name is good
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for -- you cannot use it anwhere else in your Shorewall
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configuration.</emphasis></para>
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<para>If you want to override ADD_IP_ALIASES=Yes for a particular
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entry, follow the interface name with ":" and no digit (e.g.,
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"eth0:").</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">INTERNAL</emphasis> —
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<emphasis>address</emphasis></term>
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<listitem>
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<para>Internal Address (must not be a DNS Name).</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">ALL INTERFACES</emphasis> - [<emphasis
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role="bold">Yes</emphasis>|<emphasis role="bold">No</emphasis>]</term>
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<listitem>
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<para>If Yes or yes, NAT will be effective from all hosts. If No or
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no (or left empty) then NAT will be effective only through the
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interface named in the <emphasis role="bold">INTERFACE</emphasis>
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column.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis role="bold">LOCAL</emphasis> — [<emphasis
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role="bold">Yes</emphasis>|<emphasis role="bold">No</emphasis>]</term>
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<listitem>
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<para>If <emphasis role="bold">Yes</emphasis> or <emphasis
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role="bold">yes</emphasis>, NAT will be effective from the firewall
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system</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>FILES</title>
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<para>/etc/shorewall/nat</para>
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</refsect1>
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<refsect1>
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<title>See ALSO</title>
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<para><ulink
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url="http://shorewall.net/NAT.htm">http://shorewall.net/NAT.htm</ulink></para>
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<para>shorewall(8), shorewall-accounting(5), shorewall-actions(5),
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shorewall-blacklist(5), shorewall-hosts(5), shorewall-interfaces(5),
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shorewall-maclist(5), shorewall-masq(5), shorewall-netmap(5),
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shorewall-params(5), shorewall-policy(5), shorewall-providers(5),
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shorewall-proxyarp(5), shorewall-route_routes(5),
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shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5),
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shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5),
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shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5)</para>
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</refsect1>
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</refentry> |