56 lines
4.0 KiB
HTML
56 lines
4.0 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Configure Traffic Flow Confidentiality (TFC)" />
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<meta name="abstract" content="If your data policy is configured for Tunnel mode you can use Traffic Flow Confidentiality (TFC) to conceal the actual length of the data packets transferred over a VPN connection." />
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<meta name="description" content="If your data policy is configured for Tunnel mode you can use Traffic Flow Confidentiality (TFC) to conceal the actual length of the data packets transferred over a VPN connection." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2000, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2000, 2006" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Configure Traffic Flow Confidentiality (TFC)</title>
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</head>
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<body id="rzajatfc"><a name="rzajatfc"><!-- --></a>
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<img src="./delta.gif" alt="Start of change" /><!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Configure Traffic Flow Confidentiality (TFC)</h1>
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<div><p>If your data policy is configured for Tunnel mode you can use Traffic
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Flow Confidentiality (TFC) to conceal the actual length of the data packets
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transferred over a VPN connection. </p>
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<p>TFC adds extra padding to the packets being sent and sends dummy packets
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with different lengths at random intervals to conceal the actual length of
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the packets. Use TFC for extra security against attackers who might guess
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the type of data being sent from the length of the packet. When you enable
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TFC you gain more security, but at the cost of system performance. Therefore,
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you should test your systems performance before and after you enable TFC on
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a VPN connection. TFC is not negotiated by IKE, and user should only enable
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TFC when both systems support it.</p>
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<p>To enable TFC on a VPN connection follow these steps:</p>
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<ol><li>In <span class="keyword">iSeries™ Navigator</span>, expand your
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server > <span class="menucascade"><span class="uicontrol">Network</span> > <span class="uicontrol">IP Policies</span> > <span class="uicontrol">Virtual Private Networking</span> > <span class="uicontrol">Secure Connections</span> > <span class="uicontrol"> All Connections</span></span>.</li>
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<li>Right-click the connection you want to enable TFC and select <span class="uicontrol">Properties</span>. </li>
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<li>On the <span class="uicontrol">General</span> tab select <span class="uicontrol">Use Traffic
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Flow Confidentiality (TFC) when in Tunnel Mode</span>.</li>
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</ol>
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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="rzajacreatevpncon.htm" title="After planning for your VPN, you can begin configuring it. This topic provides you with an overview of what you can do with VPN and how to do it.">Configure VPN</a></div>
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