59 lines
3.3 KiB
HTML
59 lines
3.3 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" 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="dc.language" scheme="rfc1766" 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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<meta name="dc.date" scheme="iso8601" content="2005-09-06" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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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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<title>Application proxies</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="appprox"></a>
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<h3 id="appprox">Application proxies</h3>
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<p>An application proxy or application proxy server receives requests
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intended for another server and acts on the client's behalf (as the client's
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proxy) to obtain the requested service. You often use an application proxy
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server when the client and the server are incompatible for direct connection.
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For example, the client is unable to meet the security authentication requirements
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of the server but should be permitted some services. Characteristics of an
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application proxy include the following:</p>
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<ul>
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<li>Breaks the TCP/IP connection between a client and server; IP forwarding
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is not required.</li>
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<li>Hides the internal client IP addresses; only the public IP address of
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the proxy server is visible from the external network</li>
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<li>Provides detailed access logs</li>
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<li>Authenticates uses</li>
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<li>Caches information</li></ul>
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<p>The most common type of proxy is the HTTP proxy. Most HTTP
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proxies also handle Secure HTTP (HTTPS) and file transfer protocol (FTP).
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The SMTP mail relay is an example of an application proxy.</p>
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<p>The main drawback of application proxies is that they must
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support the application for which they are performing the proxy function.
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Many TCP/IP applications are not supported by proxy servers. In addition,
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application proxies do not typically encrypt data.</p>
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<p> Some Universal Connection applications can flow through a
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standard HTTP proxy. The HTTP proxy must support SSL tunneling and can optionally
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require HTTP Basic Authentication.</p>
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<p>i5/OS™ V5R4 includes a service and support HTTP Proxy which
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can be used specifically for Universal Connection applications if you want
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one partition or system providing connectivity for others.</p>
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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