72 lines
4.6 KiB
HTML
72 lines
4.6 KiB
HTML
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<meta name="DC.Title" content="Concepts" />
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<meta name="abstract" content="This topic describes how the intrusion detection system works." />
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<meta name="description" content="This topic describes how the intrusion detection system works." />
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<title>Concepts</title>
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<body id="rzaubconcepts"><a name="rzaubconcepts"><!-- --></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">Concepts</h1>
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<div><p>This topic describes how the intrusion detection system works.</p>
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<p><span>Intrusion detection uses the <span class="filepath">idspolicy.conf</span> file
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that contains a set of policies for intrusion events. Each policy has an associated
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condition and action, but there might be more than one condition associated
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with the same action.</span> The TCP/IP stack reports the most common potential
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intrusion events and audits them, so that you can write an application to
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analyze the data and report to the security administrator if intrusions are
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likely to be underway. The following diagram shows how the intrusion detection
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function works. </p>
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<div class="p"><br /><a name="rzaubconcepts__ids"><!-- --></a><img id="rzaubconcepts__ids" src="rzaub500.gif" alt="Intrusion detection system" /><br /><ol><li>You edit the <span class="filepath">idspolicy.conf</span> file to detect specific
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types of intrusions, and <span>then you</span> start the QoS server.</li>
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<li>The QoS policy agent reads the intrusion detection policy in the <span class="filepath">idspolicy.conf</span> file.</li>
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<li>The QoS policy agent sends a message with machine instructions to the
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QoS manager.</li>
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<li>The QoS manager interprets the machine instructions and sends them to
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the intrusion detection system inside the TCP/IP stack. The TCP/IP stack manages
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outbound traffic and inbound traffic in the network, and routes requests to
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other computers in the network.</li>
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<li>The intrusion detection system creates the policies in the port table.
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The port table entries represent ports 0 through port 65 535.
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For example, port 0, <span>which contains conditions that apply
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to all ports</span>, points to intrusion condition 1 which points to action
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1. Similarly, port 1 points to condition 2 which points to action 2. Port
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1 also points to condition 3 which points to action 1, and so on.</li>
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<li>When the TCP/IP stack detects an intrusion, it looks for matching conditions
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in the port table and executes the specific action, for example, creating
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an IM auditing record or system statistics.</li>
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<li>The system creates an IM audit record which describes the type of intrusion
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event.</li>
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<li>The system administrator analyzes the IM audit record to determine which
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security actions to take, such as closing off the port from where the intrusion
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originated.</li>
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</ol>
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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="rzaubkickoff.htm" title="Intrusion detection involves gathering information about unauthorized access attempts and attacks coming in over the TCP/IP network. Security administrators can analyze the auditing records that intrusion detection provides to secure the iSeries network from these types of attacks.">Intrusion detection</a></div>
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</div>
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