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Intel 1520 manual News article caching

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News article caching

The Intel NetStructure Cache Appliance can function as a news server or a caching news server. News, also known as USENET and discussions, is a system of online discussion groups. NNTP is the protocol used to retrieve and distribute these discussion groups. The appliance supports NNTP as speciﬁed in RFC 977 and many common and proposed extensions.

To read news articles, users need a news reader, such as Netscape Communicator or Microsoft Internet Explorer, and access to a news server. The appliance is a caching news server. It can be conﬁgured to sit transparently between users and a parent or backing news server, increasing responsiveness for the user and decreasing network bandwidth use and the load on the parent news server.

Intel NetStructure

Cache Appliance

users

Intel NetStructure

Cache Appliance

Parent

NNTP

usersServer

Figure 9 Intel NetStructure Cache Appliances caching news articles for a distant NNTP server

The appliance provides many options that you can conﬁgure for supporting parent NNTP servers. The rest of this section describes the appliance’s NNTP features.

138Intel NetStructure Cache Appliance Administrator’s Guide

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Intel 1520 manual News article caching

Contents

Intel NetStructure 1520 Cache Appliance Copyright 2000, Intel Corporation. All rights reserved Contents Configuring the Appliance Using the Command-Line Interface Troubleshooting Problems 109 Error Messages 151 Changing network address configuration on the NIC Contents 106 Preface Convention Purpose Who should read this manualConventions used in this manual BoldChapter IntroductionFlexible cache architecture What is an Intel NetStructure Cache Appliance?Why use this caching appliance? Web proxy cacheIntel NetStructure Cache Appliance features High-speed caching Secure, single-point administrationMultithreading process support Broad protocol supportPerformance reporting How to use this guideSnmp Network Management To find out about … See …Page Getting Started Controls and physical features on your system Starting the system for the first timeCommand-line interface‚ on Hhmmss Getting Started Accessing the Manager UI Using Monitor and Configure mode DashboardMonitor mode frame Configure mode frame Changing passwords Using online helpAccessing the command-line interface Verifying that caching worksPage Monitoring Appliance Performance Accessing monitor pages Using the DashboardExposing node detail Resolving alarmsDashboard alert lights Alert light Condition DescriptionUsing the Node Changing the selected nodeUsing the Cache Using the GraphsUsing the Protocols Using the ARMUsing the Other Using the MrtgConfiguring the Appliance Accessing configure pages Using the Server BasicsSetting general options NetStructure Cache sectionOption Description Using virtual IP addressing for node failover Setting Web management optionsSetting virtual IP addressing options What are virtual IP addresses?Adding entries to the Virtual IP address list Setting browser auto configuration options Setting throttling of network connectionsConfiguring load-shedding Enabling Snmp agents Configuring Http Option DefinitionConfiguring Nntp Name and port see Option Definition Configuring FTP FTPCache activation Storage FreshnessFor IMS If Modified Since revalidation requests Variable content Following table describes the variable conﬁguration optionsUsing the Security Using the RoutingLink displays the Change Administrator’s Password Setting Http parent caching options Setting ICP options Establishing ICP peersField Description Setting server accelerator options Option DescriptionUsing the Host Database Checking transparencyChecking Wccp Configuring the host database Another invalid hostname message to the user Configuring DNS Using the SnapshotsReaching the Snapshots Using the Command-Line Interface Starting the command-line interface Using the appliance after initial start-upStarting the appliance the first time Navigating the command-line interface To do this Do thisUsing the setup menu Changing network addresses configurationChanging the controller speed and transmission mode Changing the DNS address and domain nameChanging the gateway address Viewing current network address settings Configuring time zone settingsConfiguring date and time settings Using the main menuChecking the status of the Server and Manager Starting the applianceStopping the appliance Installing a new version of the appliance software Viewing and maintaining versions of the softwareApplication upgrade Patch upgrade OS/Application upgradeRunning a different version of the appliance software Clearing statistics Deleting a version of the appliance softwareRebooting the System Halting the SystemResetting to factory settings Using the config menuPreparing a cache disk Setting general controls Configuring protocol options Configuring Http optionsConfiguring Nntp options Conﬁguring Nntp servers Following table describes the tags you can use in a rule Tag DescriptionTag Description Examples Conﬁguring Nntp access Following table lists the access directive options If access is Authenticator is User is Pass isConfiguring Secure Socket Layer SSL port Configuring FTP optionsSetting filter rules Primary Destination Allowed ValueSecondary Specifier Allowed Value Action ValueSetting remap rules Target Configuring the cache Enabling caching for different protocolsSetting disk storage options Setting object freshness optionsFollowing table shows the options Configuring caching rules Request URL method use one of the following Destip=112.12.12.12 scheme=ftp action=never-cache Configuring security options Controlling client access to the applianceControlling access to the Manager UI Configuring routing options Configuring and maintaining ICP peersViewing and modifying ICP rules Following table describes each ﬁeld Example McttlViewing current ICP settings Enabling and disabling ICPSetting the ICP port number Setting the ICP query timeoutEnabling and disabling multicast in ICP Controlling parent proxy caching Secondary Specifiers Allowed Value Action Tag Allowed ValueAction Tag Allowed Value Configuring Wccp options Configuring the Adaptive Redirection Module ARM Enabling and disabling transparent redirectionConfiguring ARM bypass rules Rule DescriptionBypass rules have the following format Rule FormatConfiguring the host database options Configuring load-shedding optionsOption Description Configuring logging options Statistic Description Cache Using the monitor menuViewing Node statistics ProgressNetwork Viewing Protocol statisticsStatistic Description Statistics DescriptionStatistics Description Client ServerStatistics Description Operations Statistics Description Queries OriginatingFrom this Node Viewing Cache statistics From ICP PeersViewing Other statistics Statistic Description Using the expert menu Using the save menu Using the load menuUsing the logoff menu Troubleshooting Problems Rebooting your system Rebooting your system from the CLIUpgrading software Page Caching Solutions and Performance Appendix aWeb proxy caching Day in the life of a cache requestEnsuring cached object freshness Cache missExpires header test Revalidating objectsHttp object freshness tests Last-Modiﬁed / Date header testDefault test Deciding whether to serve Http objectsRevalidate rules Configuring Http freshness options Configuring Http revalidationConfiguring Http cachability Caching Http alternatesTo cache or not to cache? Transparent proxy caching Directive source Caching directivesServing requests transparently Interception strategiesUsing a layer 4-aware switch to filter transparency requests Using a WCCP-enabled router for transparency Using policy-based routing to filter transparency requests Using a router to ﬁlter Http requests ARM redirectionAdaptive interception bypass Appliance adaptive bypassMore about bypass rules Source bypass Configuring bypass optionsStatic and dynamic adaptive bypass Destination bypassServer acceleration Advantages of server acceleration How server acceleration worksRetrieving requested documents Whereas the corresponding proxy request would look like this Web server redirects Understanding server acceleration mapping rules Examples of rules and translations User Request Translated RequestUser Request Origin Server Header Translated Header Understanding cache hierarchies Http cache hierarchiesICP cache hierarchies MissNntp cache hierarchies BombayNews article caching Appliance as a news server Appliance as a caching proxy news serverSupporting several parent news servers Several news servers supplying the same groups Blocking particular groupsClustering Several servers supplying different groupsPosting Maintaining the cache updates and feedsTransparency Pull the overview information for speciﬁed groupsDynamically subscribe to speciﬁed groups Configuring Access controlPull the articles for speciﬁed groups Take a partial feed push for speciﬁed groupsClient bandwidth throttling Self-tuning DataFlow coreObeying Nntp control messages Carrier-class architectureAlias-free caching Fine-grained parallelismRaw-disk object store Fast space reclamationHigh-availability AlarmsAdvanced protocol features Fast kernel packet engineVirtual IP failover Monitor DashboardNode fault tolerance Expansion capabilitiesLoad shedding Centralized administration Client ACL Page Error Messages Appendix BHtml messages sent to clients Title Code DescriptionAppendix B Error Messages 153 Standard Http response messages Message DescriptionAppendix B Error Messages 155 Page Glossary DNS ISP POP Wccp Page Index News server features