120 lines
7.7 KiB
HTML
120 lines
7.7 KiB
HTML
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<meta name="DC.Title" content="Troubleshoot packet rules" />
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<meta name="abstract" content="This topic provides troubleshooting advice for some common packet rules problems." />
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<title>Troubleshoot packet rules</title>
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<body id="rzajbt-trouble"><a name="rzajbt-trouble"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Troubleshoot packet rules</h1>
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<div><p>This topic provides troubleshooting advice for some common packet
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rules problems.</p>
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<div class="section"><ul><li><strong>iSeries™ communications
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trace</strong> capability allows you to see all datagram traffic for a specified
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interface. Use the <span class="cmdname">Start Communications Trace (STRCMNTRC)</span> and <span class="cmdname">Print
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Communications Trace (PRTCMNTRC)</span> commands to collect and print the
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information. </li>
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<li><strong>NAT and IP filtering rule order</strong> determines how your rules are processed.
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They are processed in the order which they appear in the file. If the order
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is not correct, the packets will not be processed as you intend. This will
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leave your system vulnerable to attack. Place your filter set names in the
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FILTER_INTERFACE statement in the exact same order in which the sets are physically
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defined in the file. <p>See the <a href="rzajbrzajb8a0creatingsd.htm#rzajb8a0-creating_sd">Create
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IP filter rules</a> topic for more information about writing syntactically
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correct filter rules. Remember the process shown in the following table.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th align="left" valign="top" width="50%" id="d0e47">Inbound traffic process</th>
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<th align="left" valign="top" width="50%" id="d0e49">Outbound traffic process</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="50%" headers="d0e47 ">1. NAT rules</td>
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<td align="left" valign="top" width="50%" headers="d0e49 ">1. IP filter rules</td>
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</tr>
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<tr><td valign="top" width="50%" headers="d0e47 ">2. IP filter rules</td>
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<td valign="top" width="50%" headers="d0e49 ">2. NAT rules</td>
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</tr>
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</tbody>
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</table>
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</div>
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</li>
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<li><strong>Removing all rules</strong> is the best way to reset your system and clear
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out errors. On the iSeries, issue the following command: <span class="cmdname">RMVTCPTBL
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(Remove TCP/IP Table)</span>. If you lock yourself out of the iSeries Navigator
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application, you can also use this command to go back and repair any rules.
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<div class="note"><span class="notetitle">Note:</span> The <span class="cmdname">Remove TCP/IP Table</span> command also starts the
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VPN servers— only if the VPN servers (IKE and ConMgr) were running before. </div>
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</li>
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<li><strong>Allowing IP datagram forwarding</strong> in your TCP/IP configuration on
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the iSeries server
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is essential if you are using NAT. Use the <span class="cmdname">Change TCP/IP Attributes
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(CHGTCPA)</span> command to verify that IP datagram forwarding is set to
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YES.</li>
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<li><strong>Verifying default return routes</strong> ensures that the address that you
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map to or hide behind is correct. This address must be routable on the return
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route back to the iSeries server and pass through the correct line
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to be untranslated by NAT. <div class="note"><span class="notetitle">Note:</span> If your iSeries server has more than one network,
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or line, connected to it, you should be especially careful about routing inbound
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traffic. Inbound traffic is handled on any line that it enters on, which might
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not be the correct line waiting to untranslate it.</div>
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</li>
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<li><strong>Viewing error and warning messages</strong> in the <samp class="codeph">EXPANDED.OUT</samp> file
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to ensure the rules are ordered as you intend. When you verify and activate
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a set of filters, these filters are merged with any iSeries Navigator-generated rules. The
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combination produces the merged rules in a new file called <samp class="codeph">EXPANDED.OUT</samp>,
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which is placed in the same directory that contains your rules (typically
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/QIBM). Warning and error messages refer to this file. To view this file,
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complete the following steps to open it from the Packet Rules Editor. <ol><li>Access the Packet Rules Editor in iSeries Navigator.</li>
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<li>From the <span class="uicontrol">File</span> menu, select <span class="uicontrol">Open</span>.</li>
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<li>Go to the directory, <samp class="codeph">QIBM/UserData/OS400/TCPIP/PacketRules/</samp> or
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to the directory where you have saved your packet rules if it's different
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than the default.</li>
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<li>From the <span class="uicontrol">Open file</span> window, select <span class="uicontrol">EXPANDED.OUT
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file</span>. The <samp class="codeph">EXPANDED.OUT</samp> file should appear. </li>
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<li>Select this file and click <span class="uicontrol">Open</span>.</li>
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</ol>
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<p>The EXPANDED.OUT file is for your information only. You cannot edit
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it.</p>
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</li>
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</ul>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajbrzajb0ippacketsecuritysd.htm" title="IP filtering and network address translation (NAT) act like a firewall to protect your internal network from intruders.">IP filtering and network address translation</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzajbrzajb0dexample2.htm" title="In this scenario, your company uses static network address translation (NAT) to map its private IP addresses to public addresses.">Scenario: Map IP addresses using NAT</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzajbrzajb8accessingsd.htm" title="Use the Packet Rules Editor to start creating packet rules on your system.">Access packet rules</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzajbrzajb8a0creatingsd.htm" title="When you create a filter, you specify a rule that governs the IP traffic flow in and out of your system.">Create IP filter rules</a></div>
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</div>
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</div>
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</body>
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