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Intel 1520 manual Configuring the host database options, Configuring load-shedding options

Models: 1520

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3Select bypass, and press Enter.

4Select rules, and press Enter.

5Select view rules, and press Enter. Doing so displays the ﬁle containing ARM bypass rules.

Configuring load-shedding options

When transparent proxy caching is enabled, the appliance handles overload conditions by forwarding new requests to origin servers. You can conﬁgure the appliance to automatically shed load if the cache-hit transaction times become too long.

▼Conﬁguring load-shedding options

1 Select the conﬁg menu, and press Enter.

2 Select arm, and press Enter.

3 Select shedding, and press Enter. Doing so displays a ﬁeld that has the current value for the maximum number of connections.

4 Supply the maximum number of connections in the ﬁeld and press Enter. 5 Press CTRL-X to save your changes and return to the previous screen.

Configuring the host database options

The appliance host database stores the domain name server (DNS) entries of servers that are contacted to fulﬁll user requests. You can conﬁgure and view the host database.

▼Conﬁguring host database options

1 Select the conﬁg menu, and press Enter.

2 Select hostdb, and press Enter.

3 Select conﬁgure, and press Enter. Doing so displays current values for the options you can set.

4 Supply a value for each ﬁeld you want to change, and press Enter after ﬁlling in each ﬁeld.

96Intel NetStructure Cache Appliance Administrator’s Guide

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Intel 1520 manual Configuring the host database options, Configuring load-shedding options

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 Who should read this manual Conventions used in this manualConvention Purpose BoldChapter IntroductionWhat is an Intel NetStructure Cache Appliance? Why use this caching appliance?Flexible cache architecture Web proxy cacheIntel NetStructure Cache Appliance features Secure, single-point administration Multithreading process supportHigh-speed caching Broad protocol supportHow to use this guide Snmp Network ManagementPerformance reporting 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 Using online help Accessing the command-line interfaceChanging passwords Verifying that caching worksPage Monitoring Appliance Performance Accessing monitor pages Using the DashboardResolving alarms Dashboard alert lightsExposing node detail Alert light Condition DescriptionUsing the Node Changing the selected nodeUsing the Graphs Using the ProtocolsUsing the Cache Using the ARMUsing the Other Using the MrtgConfiguring the Appliance Accessing configure pages Using the Server BasicsSetting general options NetStructure Cache sectionOption Description Setting Web management options Setting virtual IP addressing optionsUsing virtual IP addressing for node failover 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 Configuring time zone settings Configuring date and time settingsViewing current network address 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 Using the monitor menu Viewing Node statisticsStatistic Description Cache ProgressViewing Protocol statistics Statistic DescriptionNetwork 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 missRevalidating objects Http object freshness testsExpires header test 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 Configuring bypass options Static and dynamic adaptive bypassSource 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 Blocking particular groups ClusteringSeveral news servers supplying the same groups Several servers supplying different groupsMaintaining the cache updates and feeds TransparencyPosting Pull the overview information for speciﬁed groupsConfiguring Access control Pull the articles for speciﬁed groupsDynamically subscribe to speciﬁed groups Take a partial feed push for speciﬁed groupsSelf-tuning DataFlow core Obeying Nntp control messagesClient bandwidth throttling Carrier-class architectureFine-grained parallelism Raw-disk object storeAlias-free caching Fast space reclamationAlarms Advanced protocol featuresHigh-availability 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