User manual 3COM SUPERSTACK 3 WEBCACHE 3000

[. . . ] SuperStack® 3 Webcache User Guide SuperStack 3 Webcache 1000 3C16115 SuperStack 3 Webcache 3000 3C16116 SuperStack 3 Web Site Filter 3C16118 http://www. 3com. com/ Part No. DUA1611-5AAA04 Published November 2002 3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145 Copyright © 2002, 3Com Technologies. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Technologies. 3Com Technologies reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Technologies to provide notification of such revision or change. [. . . ] The next time a client requests content from a Web server the Webcache will need to fetch this content from the Web server as it will not have any cached Web objects. Use this option if you have recently activated or updated the Cache Control list. I 5 Click OK. Clearing the cache will slow down the access for your clients and increase the WAN bandwidth that you use, until the Webcache has built up a cache of DNS entries and Web objects. Cache Bypass Cache Bypass allows you to prevent the Webcache from processing Web requests that cannot be served successfully when the Webcache is Cache Bypass 187 deployed in Transparent cache mode. Cache Bypass is useful in the unlikely event that you have a Transparent cache deployment (not Proxy Relay) and find a Web site that does not operate correctly with the Transparent cache. A small number of Web sites perform IP address validation with the client machine that sent the Web request and will refuse a connection if a Transparent Webcache is present. If you administer an NBX system you may find that the Webcache times out when retrieving Call Logging information. If this happens, add the IP address of your NBX system to the Client Bypass list. 3Com maintains a list of IP addresses of Websites that do not work correctly with Transparent Webcaches. Enter the following URL into your Web browser: http://knowledgebase. 3com. com (correct at time of publication) Cache Bypass allows you to prevent the Webcache from being involved in requests to those particular Web sites. All requests to the Web sites that you include in the Cache Bypass lists will completely bypass the Webcache and go straight to the origin servers, ensuring that the Web sites that did not work with a Transparent cache will function correctly. The Web requests will not appear in the Access Log and will not be subject to the access control settings that you make in the Web Site Blocking or Filtering Exclusion commands. Changes that you make to Cache Bypass are performed without interrupting the caching service. You can create two types of Cache Bypass list: I Client Bypass List You can create a list of client machine IP addresses or address ranges. All Web requests from those client machines will bypass the Webcache and go straight to the origin server. I Web Site Bypass List 188 CHAPTER 11: CONTROLLING HOW WEB SITES ARE CACHED You can create a list of Web site IP addresses or address ranges. All requests from client machines to those domains will bypass the Webcache and go straight to the origin server. You can only use Cache Bypass lists when the Webcache is deployed in Transparent Cache mode. For further information, see "Transparent Cache Deployment" on page 36. Setting Up Cache Bypass To set up Cache Bypass using the Web interface: 1 Log in to the Web interface. Creating Cache Bypass Lists There are two types of Cache Bypass List that you can create, Client Bypass and Web Site Bypass. Each list contains the IP addresses or IP address ranges of the client machines or Web sites that you want to bypass and both list types are created in the following ways: I Manually entering each IP address or IP address range in the Edit Client Bypass List or Edit Site Bypass List screens. Loading an existing list of IP addresses or IP address ranges from an external text file in the Load List From File screen. A combination of the above methods. I I Manually Entering an IP Address Into the Cache Bypass Lists To manually enter an IP address or IP address range in the Client Bypass List or Web Site Bypass List: 1 Log in to the Web interface. 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It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. <one line to give the program's name and a brief idea of what it does. > Copyright (C) 19yy <name of author> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. [. . . ]