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Remove a section about ipfilter FTP Proxy Bugs, which were resolved in

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version 3.4.3 released in 2000, a little ago.

PR:		docs/95263
Submitted by:	Joe <fbsd_user at a1poweruser dot com>
This commit is contained in:
Remko Lodder 2007-07-02 19:46:27 +00:00
parent 1e03e70407
commit babc93b92a
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=30399
1 changed files with 0 additions and 21 deletions
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21
en_US.ISO8859-1/books/handbook/firewalls/chapter.sgml
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@ -2030,27 +2030,6 @@ pass out quick on rl0 proto tcp from any to any port &gt; 1024 flags S keep stat
# Active mode let data channel in from FTP server # Active mode let data channel in from FTP server
pass in quick on rl0 proto tcp from any to any port = 20 flags S keep state</programlisting> pass in quick on rl0 proto tcp from any to any port = 20 flags S keep state</programlisting>
</sect3> </sect3>
<sect3>
<title>FTP <acronym>NAT</acronym> Proxy Bug</title>
<para>As of IPFILTER version 3.4.31
the FTP proxy works as documented during the FTP session
until the session is told to close. When the close happens
packets returning from the remote FTP server are blocked and
logged coming in on port 21. The <acronym>NAT</acronym>
FTP/proxy appears to remove its temp rules prematurely,
before receiving the response from the remote FTP server
acknowledging the close. A problem report was posted to the
IPF mailing list.</para>
<para>The solution is to add a filter rule to get rid of these
unwanted log messages or do nothing and ignore FTP inbound
error messages in your log. Most people do not use outbound
FTP too often.</para>
<programlisting>block in quick on rl0 proto tcp from any to any port = 21</programlisting>
</sect3>
</sect2> </sect2>
</sect1> </sect1>