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git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@2605 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
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teastep 2005-08-31 14:56:10 +00:00
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48
Shorewall-docs2/two-interface.xml
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@ -33,6 +33,13 @@
</legalnotice>
</articleinfo>
<caution>
<para><emphasis role="bold">This article applies to Shorewall 3.0 and
later. If you are running a version of Shorewall earlier than Shorewall
3.0.0 then please see the documentation for that
release.</emphasis></para>
</caution>
<section>
<title>Introduction</title>
@ -596,28 +603,33 @@ fw net ACCEPT</programlisting> The above policy will:
<para>The general form of a simple port forwarding rule in <filename
class="directory">/etc/shorewall/</filename><filename>rules</filename> is:
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
DNAT net loc:<emphasis>&lt;server local ip address&gt;</emphasis>[:<emphasis>&lt;server port&gt;</emphasis>] <emphasis>&lt;protocol&gt;</emphasis> <emphasis>&lt;port&gt;</emphasis></programlisting>
<example label="1">
DNAT net loc:<emphasis>&lt;server local ip address&gt;</emphasis>[:<emphasis>&lt;server port&gt;</emphasis>] <emphasis>&lt;protocol&gt;</emphasis> <emphasis>&lt;port&gt;</emphasis></programlisting>Shorewall
has macros for many popular applications. Look at
/usr/share/shorewall/macro.* to see what is available in your release.
Macros simplify creating DNAT rules by supplying the protocol and port(s)
as shown in the following examples.</para>
<para><example label="1">
<title>Web Server</title>
<para>You run a Web Server on computer 2 and you want to forward
incoming <acronym>TCP</acronym> port 80 to that system:
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
Web/DNAT net 192.168.1.5</programlisting></para>
Web/DNAT net loc:192.168.1.5</programlisting></para>
</example> <example label="2">
<title>FTP Server</title>
<para>You run an <acronym>FTP</acronym> Server on computer 1 so you
want to forward incoming <acronym>TCP</acronym> port 21 to that
system: <programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
FTP/DNAT net 10.10.10.1</programlisting> For <acronym>FTP</acronym>,
you will also need to have <acronym>FTP</acronym> connection tracking
and <acronym>NAT</acronym> support in your kernel. For vendor-supplied
kernels, this means that the <filename
class="libraryfile">ip_conntrack_ftp</filename> and <filename
class="libraryfile">ip_nat_ftp</filename> modules must be loaded.
Shorewall will automatically load these modules if they are available
and located in the standard place under <filename
FTP/DNAT net loc:10.10.10.1</programlisting> For
<acronym>FTP</acronym>, you will also need to have
<acronym>FTP</acronym> connection tracking and <acronym>NAT</acronym>
support in your kernel. For vendor-supplied kernels, this means that
the <filename class="libraryfile">ip_conntrack_ftp</filename> and
<filename class="libraryfile">ip_nat_ftp</filename> modules must be
loaded. Shorewall will automatically load these modules if they are
available and located in the standard place under <filename
class="directory">/lib/modules/&lt;kernel
version&gt;/kernel/net/ipv4/netfilter</filename>.</para>
</example> A couple of important points to keep in mind: <itemizedlist>
@ -716,11 +728,10 @@ DNS/ACCEPT fw net</programlisting>This rule allows
accept connection requests have names that begin with
<quote>Allow</quote>.</para>
<para>You don't have to use defined actions when coding a rule in
<filename>/etc/shorewall/rules</filename>; the generated Netfilter ruleset
is slightly more efficient if you code your rules directly rather than
using defined actions. The the rule shown above could also have been coded
as follows:<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
<para>You don't have to use defined macros when coding a rule in
<filename>/etc/shorewall/rules</filename>; Shorewall will start slightly
faster if you code your rules directly rather than using macros. The the
rule shown above could also have been coded as follows:<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
ACCEPT fw net udp 53
ACCEPT fw net tcp 53</programlisting></para>
@ -734,9 +745,8 @@ SSH/ACCEPT loc fw</programlisting> That rule allows you to run an
from your local systems.</para>
<para>If you wish to enable other connections from your firewall to other
systems, the general format using an <quote>Allow</quote> action is:
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
&lt;action&gt; fw <emphasis>&lt;destination zone&gt;</emphasis></programlisting>The
systems, the general format using a macro is: <programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
&lt;macro&gt;/ACCEPT fw <emphasis>&lt;destination zone&gt;</emphasis></programlisting>The
general format when not using defined actions is:<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
ACCEPT fw <emphasis>&lt;destination zone&gt; &lt;protocol&gt; &lt;port&gt;</emphasis></programlisting><example>
<title>Web Server on Firewall</title>