133 lines
8.8 KiB
HTML
133 lines
8.8 KiB
HTML
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<title>Scenario: Protect an L2TP voluntary tunnel with IPSec</title>
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<body id="rzajaremoteuser"><a name="rzajaremoteuser"><!-- --></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">Scenario: Protect an L2TP voluntary tunnel with IPSec</h1>
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<div><p>In this scenario, you learn how to setup a connection between a
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branch office host and a corporate office that uses L2TP protected by IPSec.
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The branch office has a dynamically assigned IP address, while the corporate
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office has a static, globally routable IP address.</p>
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<div class="section"><h4 class="sectionscenariobar">Situation</h4><p>Suppose
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your company has a small branch office in another state. Throughout any given
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workday the branch office may require access to confidential information about
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an <span class="keyword">iSeries™</span> system within
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your corporate intranet. Your company currently uses an expensive leased line
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to provide the branch office access to the corporate network. Although your
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company wants to continue providing secure access to your intranet, you ultimately
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want to reduce the expense associated with the leased line. This can be done
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by creating a Layer 2 Tunnel Protocol (L2TP) voluntary tunnel that extends
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your corporate network, such that the branch office appears to be part of
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your corporate subnet. VPN protects the data traffic over the L2TP tunnel.</p>
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<p>With
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an L2TP voluntary tunnel, the remote branch office establishes a tunnel directly
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to the L2TP network server (LNS) of the corporate network. The functionality
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of the L2TP access concentrator (LAC) resides at the client. The tunnel is
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transparent to the remote client's Internet Service Provider (ISP), so the
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ISP is not required to support L2TP. If you want to read more about L2TP concepts,
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see Layer 2 Tunnel Protocol (L2TP).</p>
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<div class="important"><span class="importanttitle">Important:</span> This scenario
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shows the security gateways attached directly to the Internet. The absence
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of a firewall is intended to simplify the scenario. It does not imply that
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the use of a firewall is not necessary. Consider the security risks involved
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any time you connect to the Internet.</div>
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</div>
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<div class="section" id="rzajaremoteuser__remoteuserobjective"><a name="rzajaremoteuser__remoteuserobjective"><!-- --></a><h4 class="sectionscenariobar">Objectives</h4><p>In
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this scenario, a branch office system connects to its corporate network through
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a gateway system with an L2TP tunnel protected by VPN.</p>
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<p>The main objectives
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of this scenario are:</p>
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<ul><li>The branch office system always initiates the connection to the corporate
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office.</li>
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<li>The branch office system is the only system at the branch office network
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that needs access to the corporate network. In other words, its role is that
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of a host, not a gateway, in the branch office network.</li>
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<li>The corporate system a host computer in the corporate office network.</li>
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</ul>
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</div>
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<div class="section" id="rzajaremoteuser__remoteuserdetails"><a name="rzajaremoteuser__remoteuserdetails"><!-- --></a><h4 class="sectionscenariobar">Details</h4><p>The
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following figure illustrates the network characteristics for this scenario: </p>
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<br /><img src="rzaja508.gif" alt="Network diagram depicting this and that" /><br /><p><strong>iSeries-A</strong></p>
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<ul><li>Must have access to TCP/IP applications on all systems in the corporate
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network.</li>
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<li>Receives dynamically assigned IP addresses from its ISP.</li>
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<li>Must be configured to provide L2TP support.</li>
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</ul>
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<p><strong>iSeries-B</strong></p>
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<ul><li>Must have access to TCP/IP applications on iSeries-A.</li>
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<li>Subnet is 10.6.0.0 with mask 255.255.0.0. This subnet represents the data
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endpoint of the VPN tunnel at the corporate site.</li>
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<li>Connects to the Internet with IP address 205.13.237.6. This is the connection
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endpoint. That is, iSeries-B performs key management and applies IPSec to
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incoming and outgoing IP datagrams. iSeries-B connects to its subnet with
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IP address 10.6.11.1.</li>
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</ul>
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<p>In L2TP terms, <var class="varname">iSeries-A</var> acts as the L2TP initiator,
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while <var class="varname">iSeries-B</var> acts as the L2TP terminator.</p>
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</div>
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<div class="section" id="rzajaremoteuser__rzajaconfigtask"><a name="rzajaremoteuser__rzajaconfigtask"><!-- --></a><h4 class="sectionscenariobar">Configuration
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tasks</h4><p>Assuming that TCP/IP configuration already exists and works,
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you must complete the following tasks: </p>
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</div>
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</div>
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<div>
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<ol>
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<li class="olchildlink"><a href="rzajaconfigurevpnoniseriesa3.htm">Configure VPN on iSeries-A</a><br />
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</li>
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<li class="olchildlink"><a href="rzajaconfigureapppconnection.htm">Configure a PPP connection profile and virtual line on iSeries-A</a><br />
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</li>
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<li class="olchildlink"><a href="rzajaapplythecodeppp.htm">Apply the l2tptocorp dynamic-key group to the toCorp PPP profile</a><br />
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</li>
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<li class="olchildlink"><a href="rzajaconfigurevpnoniseriesb.htm">Configure VPN on iSeries-B</a><br />
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</li>
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<li class="olchildlink"><a href="rzajaconfigureapppiseriesb.htm">Configure a PPP connection profile and virtual line on iSeries-B</a><br />
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</li>
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<li class="olchildlink"><a href="rzajaactivatepacketrules2.htm">Activate packet rules</a><br />
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</li>
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</ol>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajascenarios.htm" title="Review these scenarios to become familiar with the technical and configuration details involved with each of these basic connection types.">VPN scenarios</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="rzajal2tpprotocol.htm" title="Use this information to learn about creating a VPN connection to secure communications between your network and remote clients.">Layer 2 Tunnel Protocol (L2TP)</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="http://publib-b.boulder.ibm.com/Redbooks.nsf/RedbookAbstracts/sg245954.html" target="_blank">AS/400 Internet Security Scenarios: A Practical Approach, SG24-5954-00</a></div>
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</div>
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</div>
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</body>
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</html> |