61 lines
3.7 KiB
HTML
61 lines
3.7 KiB
HTML
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<?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 http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="VPN L2TP Flash Text" />
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<meta name="DC.Relation" scheme="URI" content="rzajavpnprotocols.htm" />
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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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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzajal2tp_pres.dita" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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>VPN L2TP Flash Text</title>
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</head>
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<body id="rzajal2tp_pres.dita"><a name="rzajal2tp_pres.dita"><!-- --></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">VPN L2TP Flash Text</h1>
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<div><p>A virtual private network (VPN) allows your company to securely extend
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its private intranet over the existing framework of a public network, such
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as the Internet. VPN supports Layer 2 Tunnel Protocol (L2TP). L2TP solutions
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provide remote users with secure, and cost-efficient access to the corporate
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network. By establishing a voluntary tunnel to the L2TP network
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server (LNS), the remote client actually becomes an extension of the corporate
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network.</p>
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<p>This conceptual scenario shows a remote client system connecting to its
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corporate network by creating an L2TP voluntary tunnel protected by VPN.</p>
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<p>To begin, the remote client establishes a connection to the Internet through
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the Internet Service Provider (ISP). The ISP assigns the client a globally
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routable IP address.</p>
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<p>Unknown to the ISP, the client initiates a VPN connection with the corporate
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VPN gateway. The gateway authenticates the client system which wants to access
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the corporate network.</p>
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<p>After the client receives authentication from the gateway (making the connection
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secure), the client establishes the L2TP tunnel. The client is still using
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the IP address assigned by the ISP. The L2TP tunnel will eventually enable
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data to travel between the client system and the corporate gateway.</p>
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<p>Once the L2TP tunnel (shown in yellow) is established, the LNS assigns
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the client an IP address within the corporate network's address scheme. There
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is no physical line assoc- iated with the connection, so a virtual line is
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created to allow PPP traffic to tunnel through the L2TP tunnel.</p>
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<p>Now IP traffic can flow between the remote client system and any system
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within the corporate network.</p>
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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="rzajavpnprotocols.htm" title="It is important that you have at least a basic knowledge of standard VPN technologies. This topic provides you with conceptual information about the protocols VPN uses in its implementation.">VPN concepts</a></div>
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</div>
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</div>
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</body>
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</html>
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