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git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@950 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
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mhnoyes 2003-12-25 16:33:31 +00:00
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26
Shorewall-docs/FTP.xml
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@ -26,8 +26,8 @@
document under the terms of the GNU Free Documentation License, Version
1.2 or any later version published by the Free Software Foundation; with
no Invariant Sections, with no Front-Cover, and with no Back-Cover
Texts. A copy of the license is included in the section entitled &#34;<ulink
url="GnuCopyright.htm">GNU Free Documentation License</ulink>&#34;.</para>
Texts. A copy of the license is included in the section entitled
<quote><ulink url="GnuCopyright.htm">GNU Free Documentation License</ulink></quote>.</para>
</legalnotice>
</articleinfo>
@ -51,7 +51,7 @@
</listitem>
<listitem>
<para>Install the Mandrake &#34;cooker&#34; version of Shorewall.</para>
<para>Install the Mandrake <quote>cooker</quote> version of Shorewall.</para>
</listitem>
<listitem>
@ -67,10 +67,10 @@
role="bold">control</emphasis> connection goes from the FTP client to port
21 on the FTP server. This connection is used for logon and to send
commands and responses between the endpoints. Data transfers (including
the output of &#34;ls&#34; and &#34;dir&#34; commands) requires a second
data connection. The <emphasis role="bold">data</emphasis> connection is
dependent on the <emphasis role="bold">mode</emphasis> that the client is
operating in:</para>
the output of <quote>ls</quote> and <quote>dir</quote> commands) requires
a second data connection. The <emphasis role="bold">data</emphasis>
connection is dependent on the <emphasis role="bold">mode</emphasis> that
the client is operating in:</para>
<variablelist>
<varlistentry>
@ -104,7 +104,7 @@
<para>You can see these commands in action using your linux ftp
command-line client in debugging mode. Note that my ftp client defaults to
passive mode and that I can toggle between passive and active mode by
issuing a &#34;passive&#34; command:</para>
issuing a <quote>passive</quote> command:</para>
<programlisting>[teastep@wookie Shorewall]$ <emphasis role="bold">ftp ftp1.shorewall.net</emphasis>
Connected to lists.shorewall.net.
@ -185,10 +185,10 @@ ftp&#62;</programlisting>
<para>Given the normal loc-&#62;net policy of ACCEPT, passive mode access
from local clients to remote servers will always work but active mode
requires the firewall to dynamically open a &#34;hole&#34; for the
requires the firewall to dynamically open a <quote>hole</quote> for the
server&#39;s connection back to the client. Similarly, if you are running
an FTP server in your local zone then active mode should always work but
passive mode requires the firewall to dynamically open a &#34;hole&#34;
passive mode requires the firewall to dynamically open a <quote>hole</quote>
for the client&#39;s second connection to the server. This is the role of
FTP connection-tracking support in the Linux kernel.</para>
@ -198,9 +198,9 @@ ftp&#62;</programlisting>
function.</para>
<para>Including FTP connection-tracking and NAT support normally means
that the modules &#34;ip_conntrack_ftp&#34; and &#34;ip_nat_ftp&#34; need
to be loaded. Shorewall automatically loads these &#34;helper&#34; modules
from /lib/modules/&#60;<emphasis>kernel-version</emphasis>&#62;/kernel/net/ipv4/netfilter/
that the modules <quote>ip_conntrack_ftp</quote> and <quote>ip_nat_ftp</quote>
need to be loaded. Shorewall automatically loads these <quote>helper</quote>
modules from /lib/modules/&#60;<emphasis>kernel-version</emphasis>&#62;/kernel/net/ipv4/netfilter/
and you can determine if they are loaded using the &#39;lsmod&#39;
command. The &#60;<emphasis>kernel-version</emphasis>&#62; may be obtained
by typing</para>