161 lines
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HTML
161 lines
9.9 KiB
HTML
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<meta name="DC.Title" content="Scenario: Basic branch office connection" />
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<title>Scenario: Basic branch office connection</title>
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<h1 class="topictitle1">Scenario: Basic branch office connection</h1>
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<div><p>In this scenario, your company wants to establish a VPN between
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the subnets of two remote departments through a pair of iSeries™ computers
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acting as VPN gateways.</p>
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<div class="section"><h4 class="sectionscenariobar">Situation</h4><p>Suppose
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your company wants to minimize the costs incurred from communicating to and
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among its own branches. Today, your company uses frame relay or leased lines,
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but you want to explore other options for transmitting internal confidential
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data that are less expensive, more secure, and globally accessible. By exploiting
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the Internet, you can easily establish a virtual private network (VPN) to
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meet the needs of your company.</p>
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<div class="p">Your company and its branch office both
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require VPN protection across the Internet, but not within their respective
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intranets. Because you consider the intranets trusted, the best solution is
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to create a gateway-to-gateway VPN. In this case, both gateways are connected
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directly to the intervening network. In other words, they are <em>border</em> or <em>edge</em> systems,
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which are not protected by firewalls. This example serves as a useful introduction
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to the steps involved in setting up a basic VPN configuration. When this scenario
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refers to the term, <em>Internet</em>, it refers to the intervening network
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between the two VPN gateways, which might be the company's own private network
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or the public Internet.<div class="important"><span class="importanttitle">Important:</span> This scenario shows the <span class="keyword">iSeries</span> security gateways attached directly
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to the Internet. The absence of a firewall is intended to simplify the scenario.
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It does not imply that the use of a firewall is not necessary. In fact, consider
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the security risks involved any time you connect to the Internet.</div>
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</div>
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</div>
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<div class="section"><h4 class="sectionscenariobar">Advantages</h4><p>This
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scenario has the following advantages:</p>
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<ul><li>Using the Internet or an existing intranet reduces the cost of private
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lines between remote subnets.</li>
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<li>Using the Internet or an existing intranet reduces the complexity of installing
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and maintaining private lines and associated equipment.</li>
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<li>Using the Internet allows remote locations to connect to almost anywhere
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in the world.</li>
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<li>Using VPN provides users access to all servers and resources on either
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side of the connection just as though they were connected using a leased line
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or wide area network (WAN) connection.</li>
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<li>Using industry standard encryption and authentication methods ensures
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the security of sensitive information passed from one location to another.</li>
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<li>Exchanging your encryption keys dynamically and regularly simplifies setup
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and minimizes the risk of your keys being decoded and security being breached.</li>
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<li>Using private IP addresses in each remote subnet makes it unnecessary
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to allocate valuable public IP addresses to each client.</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectionscenariobar">Objectives</h4><p>In this
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scenario, MyCo, Inc. wants to establish a VPN between the subnets of its Human
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Resources and Finance departments through a pair of <span class="keyword">iSeries</span> servers.
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Both servers will act as VPN gateways. In terms of VPN configurations, a gateway
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performs key management and applies IPSec to the data that flows through the
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tunnel. The gateways are not the data endpoints of the connection.</p>
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<p>The
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objectives of this scenario are as follows:</p>
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<ul><li>The VPN must protect all data traffic between the Human Resources department's
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subnet and the Finance department's subnet.</li>
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<li>Data traffic does not require VPN protection once it reaches either of
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the department's subnets.</li>
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<li>All clients and hosts on each network have full access to the other's
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network, including all applications.</li>
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<li>The gateway servers can communicate with each other and access each other's
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applications.</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectionscenariobar">Details</h4><p>The following
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figure illustrates the network characteristics of MyCo.</p>
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<br /><img src="rzaja510.gif" alt="Branch office network diagram" /><br /><p><strong>Human Resources Department</strong></p>
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<ul><li>iSeries-A runs on <span class="keyword">OS/400<sup>®</sup></span> Version
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5 Release 2 (V5R2) or later and acts as the Human Resources Department's VPN
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gateway.</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 MyCo Rochester site.</li>
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<li>iSeries-A connects to the Internet with IP address 204.146.18.227. This
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is the connection endpoint. That is, iSeries-A performs key management and
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applies IPSec to incoming and outgoing IP datagrams.</li>
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<li>iSeries-A connects to its subnet with IP address 10.6.11.1.</li>
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<li>iSeries-B is a production server in the Human Resources subnet that runs
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standard TCP/IP applications.</li>
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</ul>
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<p><strong>Finance Department</strong></p>
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<ul><li>iSeries-C runs on <span class="keyword">OS/400</span> Version
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5 Release 2 (V5R2) or later and acts as the Finance Department's
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VPN gateway.</li>
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<li>Subnet is 10.196.8.0 with mask 255.255.255.0. This subnet represents the
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data endpoint of the VPN tunnel at the MyCo Endicott site.</li>
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<li>iSeries-C connects to the Internet with IP address 208.222.150.250. This
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is the connection endpoint. That is, iSeries-C performs key management and
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applies IPSec to incoming and outgoing IP datagrams.</li>
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<li>iSeries-C connects to its subnet with IP address 10.196.8.5.</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectionscenariobar">Configuration tasks</h4><p>You
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must complete each of these tasks to configure the branch office connection
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described in this scenario:</p>
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<div class="note"><span class="notetitle">Note:</span> Before you start these tasks verify the
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TCP/IP routing to ensure that the two gateway servers can communicate with
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each other across the Internet. This ensures that hosts on each subnet route
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properly to their respective gateway for access to the remote subnet.</div>
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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="rzajacompletetheplanningworksheets.htm">Complete the planning worksheets</a><br />
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</li>
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<li class="olchildlink"><a href="rzajaconfigurevpnoniseriesa.htm">Configure VPN on iSeries-A</a><br />
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</li>
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<li class="olchildlink"><a href="rzajaconfigurevpnoniseriesc.htm">Configure VPN on iSeries-C</a><br />
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</li>
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<li class="olchildlink"><a href="rajasartthevpnservers.htm">Start the VPN servers</a><br />
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</li>
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<li class="olchildlink"><a href="rzajatestconnection.htm">Test connection</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="../rzajw/rzajwkickoff.htm">TCP/IP routing and workload balancing</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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