forked from extern/shorewall_code
473 lines
19 KiB
XML
473 lines
19 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
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<article id="IPIP">
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<!--$Id$-->
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<articleinfo>
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<title>Shorewall Support Guide</title>
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<pubdate><?dbtimestamp format="Y/m/d"?></pubdate>
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<copyright>
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<year>2001-20011</year>
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<holder>Thomas M. Eastep</holder>
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</copyright>
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<legalnotice>
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<para>Permission is granted to copy, distribute and/or modify this
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document under the terms of the GNU Free Documentation License, Version
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1.2 or any later version published by the Free Software Foundation; with
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no Invariant Sections, with no Front-Cover, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled
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<quote><ulink url="GnuCopyright.htm">GNU Free Documentation
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License</ulink></quote>.</para>
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</legalnotice>
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</articleinfo>
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<caution>
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<para><emphasis role="bold">This article applies to Shorewall 4.0 and
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later. If you are running a version of Shorewall earlier than Shorewall
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4.0.0 then please see the documentation for that
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release.</emphasis></para>
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</caution>
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<section id="First">
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<title>Before Reporting a Problem or Asking a Question</title>
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<para>There are a number of sources of Shorewall information. Please try
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these before you post.</para>
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<itemizedlist>
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<listitem>
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<para>The currently-supported Shorewall <ulink
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url="ReleaseModel.html">major release</ulink> is 4.4.</para>
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<note>
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<para>Shorewall versions earlier than 4.4.0 are no longer supported;
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we will try to help but we will not spend time reading earlier code
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to try to help you solve a problem and we will not release a patch
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to correct any defect found.</para>
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</note>
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</listitem>
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<listitem>
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<para>More than half of the questions posted on the support list have
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answers directly accessible from the <ulink
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url="Documentation_Index.html">Documentation Index</ulink></para>
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</listitem>
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<listitem>
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<para>The <ulink url="FAQ.htm">FAQ</ulink> has solutions to more than
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90 common problems.</para>
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</listitem>
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<listitem>
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<para>The <ulink url="troubleshoot.htm">Troubleshooting
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Information</ulink> contains a number of tips to help you solve common
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problems.</para>
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</listitem>
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<listitem>
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<para>The <ulink
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url="http://dir.gmane.org/gmane.comp.security.shorewall">Shorewall
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Users Mailing List Archives</ulink> are a good source of
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information.</para>
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</listitem>
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</itemizedlist>
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</section>
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<section id="Guidelines">
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<title>Problem Reporting Guidelines</title>
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<para>Please refer to the following flowchart to guide you through the
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problem reporting process. It will ensure that you provide us with the
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information we need to solve your problem as quickly as possible.</para>
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<graphic align="center" fileref="images/Troubleshoot.png" />
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<orderedlist>
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<important>
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<para><emphasis role="bold">Please don't use distribution specific
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programs like "service" or init scripts to start/restart Shorewall
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while trying to solve a problem</emphasis>, just follow carefully the
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instructions below.</para>
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</important>
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<important>
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<para>As a general matter, <emphasis role="bold">please do not edit
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the diagnostic information</emphasis> in an attempt to conceal your IP
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address, netmask, nameserver addresses, domain name, etc. These
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<emphasis role="bold">aren't secrets</emphasis>, and concealing them
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often misleads us (and 80% of the time, a cracker could derive them
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anyway from information contained in the SMTP headers of your
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post).</para>
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</important>
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<listitem>
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<para>If your problem is that an <emphasis
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role="bold">error</emphasis> occurs when you try to
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<quote><command>shorewall start</command></quote> or if Shorewall is
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otherwise failing to start properly, then please do the
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following.</para>
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<blockquote>
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<para>If your VERBOSITY setting in shorewall.conf is less than 2 and
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you are running the Shorewall-shell compiler, then try running with
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a higher verbosity level by using the "-vv" option:</para>
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<blockquote>
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<programlisting><command>shorewall -vv [re]start</command></programlisting>
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</blockquote>
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<para>That will give you additional progress messages that may make
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it clear which entry in which file is generating the error.</para>
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<para>If that didn't solve your problem, then please</para>
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<programlisting><command>/sbin/shorewall trace start 2> /tmp/trace</command></programlisting>
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<para>Forward the <filename>/tmp/trace</filename> file as an
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attachment compressed with gzip or bzip2 (If you are running
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Shorewall-perl, there is no need to compress the file — it will be
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very short).</para>
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<para>If compilation succeeds but the compiled program fails, then
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please include the compiled program with your report. The compiled
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program will be named <filename>/var/lib/shorewall/.start</filename>
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if the command is <command>shorewall start</command> and it will be
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named <filename>/var/lib/shorewall/.restart</filename> if the
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command is <command>shorewall restart</command>.</para>
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<para>If you are running Shorewall-perl 4.0.5 or later, you may also
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include the word <emphasis role="bold">debug</emphasis> as the first
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argument to the <filename>/sbin/shorewall</filename> and
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<filename>/sbin/shorewall-lite</filename> commands.<programlisting><command>shorewall debug restart</command></programlisting>In
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most cases, <emphasis role="bold">debug</emphasis> is a synonym for
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<emphasis role="bold">trace</emphasis>. The exceptions are:</para>
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<itemizedlist>
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<listitem>
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<para><emphasis role="bold">debug</emphasis> is ignored by the
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Shorewall-perl compiler.</para>
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</listitem>
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<listitem>
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<para><emphasis role="bold">debug</emphasis> causes altered
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behavior of scripts generated by the Shorewall-perl compiler.
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These scripts normally use<command> iptables-restore</command>
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to install the Netfilter ruleset but with <emphasis
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role="bold">debug</emphasis>, the commands normally passed to
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<command>iptables-restore</command> in its input file are passed
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individually to <command>iptables</command>. This is a
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diagnostic aid which allows identifying the individual command
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that is causing <command>iptables-restore</command> to fail; it
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should be used when iptables-restore fails when executing a
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<command>COMMIT</command> command.</para>
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</listitem>
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</itemizedlist>
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<warning>
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<para>The <emphasis role="bold">debug</emphasis> feature is
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strictly for problem analysis. When <emphasis
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role="bold">debug</emphasis> is used:</para>
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<orderedlist>
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<listitem>
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<para>The firewall is made 'wide open' before the rules are
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applied.</para>
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</listitem>
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<listitem>
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<para>The <filename>routestopped</filename> file is not
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consulted.</para>
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</listitem>
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<listitem>
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<para>The rules are applied in the canonical
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<command>iptables-restore</command> order. So if you need
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critical hosts to be always available during start/restart,
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you may not be able to use <emphasis
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role="bold">debug</emphasis>.</para>
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</listitem>
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</orderedlist>
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</warning>
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</blockquote>
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</listitem>
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<listitem>
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<para>If you are unsure if Shorewall is starting successfully or not
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then first note that if Shorewall starts successfully, the last
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message produced by Shorewall 3.0 is "Shorewall Started" and the last
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message produced by Shorewall is "done.":</para>
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<blockquote>
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<para></para>
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<programlisting>…
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Activating Rules...
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<emphasis role="bold">done.</emphasis>
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gateway:~#</programlisting>
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</blockquote>
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<para>If you are seeing this message then Shorewall is starting
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successfully.</para>
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<para>If you are still unsure if Shorewall is starting or not, enter
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the following command:</para>
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<blockquote>
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<programlisting><command>/sbin/shorewall status</command></programlisting>
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</blockquote>
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<para>If Shorewall has started successfully, you will see output
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similar to this:</para>
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<blockquote>
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<programlisting>Shorewall-4.0.6 Status at gateway - Thu Mar 30 14:07:29 PDT 2008
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Shorewall is running
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State:Started (Thu Mar 30 14:07:29 PDT 2006)</programlisting>
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</blockquote>
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<para>If Shorewall has not started properly, you will see output
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similar to this:</para>
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<blockquote>
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<programlisting>Shorewall-4.0.6 Status at gateway - Thu Mar 30 14:08:11 PDT 2008
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Shorewall is stopped
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State:Stopped (Thu Mar 30 14:08:11 PDT 2006)</programlisting>
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</blockquote>
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<para>The "State:" refers to the <ulink
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url="starting_and_stopping_shorewall.htm#State">Shorewall State
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Diagram</ulink>.</para>
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</listitem>
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<listitem>
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<para>If Shorewall is starting successfully and your problem is that
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some set of <emphasis role="bold">connections</emphasis> to/from or
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through your firewall <emphasis role="bold">isn't working</emphasis>
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(examples: local systems can't access the Internet, you can't send
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email through the firewall, you can't surf the web from the firewall,
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connections that you are certain should be rejected are mysteriously
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accepted, etc.) or <emphasis role="bold">you are having problems with
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traffic shaping</emphasis> then please perform the following six
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steps:</para>
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<orderedlist>
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<listitem>
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<para>Be sure that the LOGFILE setting in<filename>
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/etc/shorewall/shorewall.conf</filename> is correct (that it names
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the file where 'Shorewall' messages are being logged). See <ulink
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url="manpages/shorewall.conf.html">shorewall.conf </ulink>(5) and
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the <ulink url="shorewall_logging.html">Shorewall Logging
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Article</ulink>.</para>
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</listitem>
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<listitem>
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<para>If Shorewall isn't started then <command>/sbin/shorewall
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start</command>. Otherwise <command>/sbin/shorewall
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reset</command>.</para>
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</listitem>
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<listitem>
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<para>Try making the connection that is failing.</para>
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</listitem>
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<listitem>
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<para><command>/sbin/shorewall dump >
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/tmp/status.txt</command></para>
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</listitem>
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<listitem>
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<para>Post the <filename>/tmp/status.txt</filename> file as an
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attachment compressed with gzip or bzip2.</para>
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</listitem>
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<listitem>
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<para>Describe where you are trying to make the connection from
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(IP address) and what host (IP address) you are trying to connect
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to.</para>
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</listitem>
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</orderedlist>
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</listitem>
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<listitem>
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<para>Otherwise:</para>
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<para>Shorewall is starting successfully and you have <emphasis
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role="bold">no connection problems</emphasis> and you have <emphasis
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role="bold">no traffic shaping problems</emphasis>. Your problem is
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with performance, logging, etc. Please include the following:</para>
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<itemizedlist>
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<listitem>
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<para>the exact version of Shorewall you are running.</para>
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<programlisting><emphasis role="bold">/sbin/shorewall version</emphasis></programlisting>
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</listitem>
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<listitem>
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<para>the complete exact output of</para>
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<programlisting><command>ip addr show</command></programlisting>
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</listitem>
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<listitem>
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<para>the complete exact output of</para>
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<programlisting><command>ip route show</command></programlisting>
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</listitem>
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<listitem>
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<para>A detailed description of your problem.</para>
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</listitem>
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</itemizedlist>
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</listitem>
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</orderedlist>
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<itemizedlist>
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<listitem>
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<para>Please remember we only know what is posted in your message. Do
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not leave out any information that appears to be correct, or was
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mentioned in a previous post. There have been countless posts by
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people who were sure that some part of their configuration was correct
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when it actually contained a small error. We tend to be skeptics where
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detail is lacking.</para>
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</listitem>
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<listitem>
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<para>Please keep in mind that you're asking for <emphasis
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role="bold">free</emphasis> technical support. Any help we offer is an
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act of generosity, not an obligation. <emphasis role="bold">Try to
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make it easy for us to help you</emphasis>. Follow good, courteous
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practices in writing and formatting your e-mail. Provide details that
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we need if you expect good answers. Exact quoting of error messages,
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log entries, command output, and other output is better than a
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paraphrase or summary.</para>
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</listitem>
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<listitem>
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<para>Please <emphasis role="bold">give details about what doesn't
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work</emphasis>. Reports that say <quote>I followed the directions and
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it didn't work</quote> may elicit sympathy but probably little in the
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way of help. Again -- if ping from A to B fails, say so (and see below
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for information about reporting <quote>ping</quote> problems). If
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Computer B doesn't show up in <quote>Network Neighborhood</quote> then
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say so. If access by IP address works but by DNS names it doesn't then
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say so.</para>
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</listitem>
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<listitem>
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<para>Please don't describe your environment and then ask us to send
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you custom configuration files. We're here to answer your questions
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but we can't do your job for you.</para>
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</listitem>
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<listitem>
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<para>Please <emphasis role="bold">do NOT include the output
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of</emphasis> <command>iptables -L</command> — the output of <emphasis
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role="bold">shorewall show</emphasis> or <command>shorewall
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dump</command> is much more useful to us.</para>
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</listitem>
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<listitem>
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<para>Do you see any <quote>Shorewall</quote> messages
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(<quote><command>/sbin/shorewall show log</command></quote>) when you
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exercise the function that is giving you problems? If so, include the
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message(s) in your post.</para>
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</listitem>
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<listitem>
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<para>Please <emphasis role="bold">do not include Shorewall
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configuration files</emphasis> unless you have been specifically asked
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to do so. The output of <command>shorewall dump</command> collected as
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described above is much more useful.</para>
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</listitem>
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<listitem>
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<para><emphasis role="bold">The list server limits the size of posts
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to the lists, so don't post graphics of your network layout, etc. to
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the Mailing List -- your post will be rejected</emphasis>.</para>
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</listitem>
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<listitem>
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<para>The author gratefully acknowledges that the above list was
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heavily plagiarized from the excellent LEAF document by <emphasis>Ray
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Olszewski</emphasis> found <ulink
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url="http://leaf-project.org/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=6&MMN_position=21:21">here</ulink>.</para>
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</listitem>
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</itemizedlist>
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</section>
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<section id="Where">
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<title>Where to Send your Problem Report or to Ask for Help</title>
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<para><emphasis role="bold">If you haven't read the <link
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linkend="Guidelines">Problem Reporting Guidelines</link> above, please
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read them now — Failure to supply the information that we need will just
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delay a solution to your problem.</emphasis></para>
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<para><emphasis role="bold">If you run the current development release and
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your question involves a feature that is only available in the development
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release</emphasis> (see the <ulink url="NewRelease.html">Shorewall Release
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Model page</ulink>) then please post your question or problem to the
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<ulink url="mailto:shorewall-devel@lists.sourceforge.net">Shorewall
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Development Mailing List</ulink>.</para>
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<para>Otherwise, please post your question or problem report to the <ulink
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url="mailto:shorewall-users@lists.sourceforge.net">Shorewall users mailing
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list</ulink>.</para>
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<para><emphasis role="bold">IMPORTANT</emphasis>: You must subscribe to
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the mailing lists before you will be able to post to them (see links
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below).</para>
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<para>For <emphasis role="bold">quick questions</emphasis>, there is also
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a #shorewall channel at irc.freenode.net.</para>
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</section>
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<section id="Users">
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<title>Subscribing to the Users Mailing List</title>
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<para>To Subscribe to the users mailing list go to <ulink
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url="https://lists.sourceforge.net/lists/listinfo/shorewall-users">https://lists.sourceforge.net/lists/listinfo/shorewall-users</ulink>.</para>
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</section>
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<section id="Announce">
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<title>Subscribing to the Announce Mailing List</title>
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<para>To Subscribe to the announce mailing list (low-traffic,read only) go
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to:</para>
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<para><ulink
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url="https://lists.sourceforge.net/lists/listinfo/shorewall-announce">https://lists.sourceforge.net/lists/listinfo/shorewall-announce</ulink></para>
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</section>
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<section id="Devel">
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<title>Subscribing to the Development Mailing List</title>
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<para>To Subscribe to the development mailing list go to <ulink
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url="https://lists.sourceforge.net/lists/listinfo/shorewall-devel">https://lists.sourceforge.net/lists/listinfo/shorewall-devel</ulink>.</para>
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</section>
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<section id="Unsubscribe">
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<title>Unsubscribing from Shorewall Mailing Lists</title>
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<para>If you are really dim-witted enough to have to ask -- you
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unsubscribe at the same place that you subscribed. <emphasis
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role="bold">Doh.......</emphasis></para>
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</section>
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<section id="Other">
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<title>Other Mailing Lists</title>
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<para>For information on other Shorewall mailing lists, go to <ulink
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url="http://sourceforge.net/mail/?group_id=22587">http://sourceforge.net/mail/?group_id=22587</ulink>
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.</para>
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</section>
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</article>
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