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Update FAQ2* to use address variables

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Signed-off-by: Tom Eastep <teastep@shorewall.net>
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Tom Eastep 2017-08-01 14:56:20 -07:00
parent 80e6cd8a2f
commit c57edb0fbf
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1 changed files with 7 additions and 50 deletions
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docs/FAQ.xml
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@ -776,12 +776,7 @@ SNAT(<emphasis role="bold">130.151.100.69</emphasis>) 192.168.1.0/24 eth1:19
<para>That rule (and the second one in the previous bullet) only <para>That rule (and the second one in the previous bullet) only
works of course if you have a static external IP address. If you works of course if you have a static external IP address. If you
have a dynamic IP address then include this in have a dynamic IP address then make your DNAT rule:</para>
<filename>/etc/shorewall/params</filename>.</para>
<programlisting><command>ETH0_IP=$(find_first_interface_address eth0)</command> </programlisting>
<para>and make your DNAT rule:</para>
<programlisting>#ACTION SOURCE DEST PROTO DPORT SPORT ORIGDEST <programlisting>#ACTION SOURCE DEST PROTO DPORT SPORT ORIGDEST
@ -793,34 +788,17 @@ SNAT(<emphasis role="bold">130.151.100.69</emphasis>) 192.168.1.0/24 eth1:19
?SECTION NEW ?SECTION NEW
DNAT loc loc:192.168.1.5 tcp www - <emphasis DNAT loc loc:192.168.1.5 tcp www - <emphasis
role="bold">$ETH0_IP</emphasis></programlisting> role="bold">&amp;eth0</emphasis></programlisting>
<para>Using this technique, you will want to configure your <para>Using this technique, you will want to configure your
DHCP/PPPoE/PPTP/… client to automatically restart Shorewall each DHCP/PPPoE/PPTP/… client to automatically reload Shorewall each time
time that you get a new IP address.</para> that you get a new IP address.</para>
<note> <note>
<para>If your local interface is a bridge, see <link <para>If your local interface is a bridge, see <link
linkend="faq2e">FAQ 2e</link> for additional configuration linkend="faq2e">FAQ 2e</link> for additional configuration
steps.</para> steps.</para>
</note> </note>
<note>
<para>For optional interfaces, use the function <emphasis
role="bold">find_first_interface_address_if_any()</emphasis>
rather than <emphasis
role="bold">find_first_interface_address()</emphasis>. The former
will return 0.0.0.0 if the interface has no configured IP address;
the latter terminates the calling program.</para>
</note>
<note id="Call">
<para>If you run Shorewall-lite on your firewall, you must use the
following in the firewall's configuration directory
<filename>params</filename> file:</para>
<programlisting><command>ETH0_IP=$(ssh root@firewall "/sbin/shorewall-lite call find_first_interface_address eth0")</command></programlisting>
</note>
</listitem> </listitem>
</itemizedlist> </itemizedlist>
@ -928,14 +906,8 @@ MASQUERADE 192.168.1.0/24 eth2:192.168.1.2 tcp www</programlisting>
<emphasis role="bold">DNAT loc dmz:192.168.2.4 tcp 80 - 206.124.146.176</emphasis></programlisting> <emphasis role="bold">DNAT loc dmz:192.168.2.4 tcp 80 - 206.124.146.176</emphasis></programlisting>
<para>If your external IP address is dynamic, then you must do the <para>If your external IP address is dynamic, then you must make your
following:</para> DNAT rule:</para>
<para>In <filename>/etc/shorewall/params</filename>:</para>
<programlisting><command>ETH0_IP=`find_first_interface_address eth0`</command> </programlisting>
<para>and make your DNAT rule:</para>
<programlisting>#ACTION SOURCE DEST PROTO DPORT SPORT ORIGDEST <programlisting>#ACTION SOURCE DEST PROTO DPORT SPORT ORIGDEST
@ -947,7 +919,7 @@ MASQUERADE 192.168.1.0/24 eth2:192.168.1.2 tcp www</programlisting>
?SECTION NEW ?SECTION NEW
DNAT loc dmz:192.168.2.4 tcp 80 - <emphasis DNAT loc dmz:192.168.2.4 tcp 80 - <emphasis
role="bold">$ETH0_IP</emphasis></programlisting> role="bold">&amp;eth0</emphasis></programlisting>
<warning> <warning>
<para>With dynamic IP addresses, you probably don't want to use <para>With dynamic IP addresses, you probably don't want to use
@ -956,21 +928,6 @@ DNAT loc dmz:192.168.2.4 tcp 80 - <emphasi
save</command> and <command>shorewall[-lite] save</command> and <command>shorewall[-lite]
restore</command></ulink>.</para> restore</command></ulink>.</para>
</warning> </warning>
<note>
<para>For optional interfaces, use the function <emphasis
role="bold">find_first_interface_address_if_any()</emphasis> rather
than <emphasis
role="bold">find_first_interface_address()</emphasis>. The former
will return 0.0.0.0 if the interface has no configured IP address;
the latter terminates the calling program.</para>
</note>
<note>
<para>If you use Shorewall-lite, then you need to configure the
params file in the firewall's configuration directory as described
<link linkend="Call">above</link>.</para>
</note>
</section> </section>
<section id="faq2c"> <section id="faq2c">