Blue Coat Systems Blue Coat Systems SG Appliance, SGOS Version 5.2.2 manual Ntp

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Appendix A: Glossary

non-cacheable objects

A number of objects are not cached by the Blue Coat appliance because they are

 

considered non-cacheable. You can add or delete the kinds of objects that the

 

appliance considers non-cacheable. Some of the non-cacheable request types are:

 

• Pragma no-cache, requests that specify non-cached objects, such as when you click

 

 

refresh in the Web browser.

 

•

Password provided, requests that include a client password.

 

•

Data in request that include additional client data.

 

•

Not a GET request.

.nsc file

Created from the multicast station definition and saved through the browser as a text

 

file encoded in a Microsoft proprietary format. Without an .nsc file, the multicast

 

station definition does not work.

NTP

To manage objects in an appliance, an SG appliance must know the current Universal

 

Time Coordinates (UTC) time. By default, the SG appliance attempts to connect to a

 

Network Time Protocol (NTP) server to acquire the UTC time. SG appliance includes

 

a list of NTP servers available on the Internet, and attempts to connect to them in the

 

order they appear in the NTP server list on the NTP tab.

O

 

 

object (used in caching)

An object is the item that is stored in an appliance. These objects can be frequently

 

accessed content, content that has been placed there by content publishers, or Web

 

pages, among other things.

object (used in Visual Policy Manager)

An object (sometimes referred to as a condition) is any collection or combination of entry types you can create individually (user, group, IP address/subnet, and attribute). To be included in an object, an item must already be created as an individual entry.

object pipelining

This patented algorithm opens as many simultaneous TCP connections as the origin

 

server will allow and retrieves objects in parallel. The objects are then delivered from

 

the appliance straight to the user's desktop as fast as the browser can request them.

origin content server (OCS)

Also called origin server. This is the original source of the content that is being

 

requested. An appliance needs the OCS to acquire data the first time, to check that

 

the content being served is still fresh, and to authenticate users.

outbound traffic (bandwidth

Network packets flowing out of the SG appliance. Outbound traffic mainly consists

gain)

of the following:

 

•

Client outbound: Packets sent to the client in response to a Web request.

 

•

Server outbound: Packets sent to an OCS or upstream proxy to request a service.

P

 

 

PAC (Proxy

Originally created by Netscape, PACs are a way to avoid requiring proxy hosts and

AutoConfiguration) scripts

port numbers to be entered for every protocol. You need only enter the URL. A PAC

 

can be created with the needed information and the local browser can be directed to

 

the PAC for information about proxy hosts and port numbers.

packet capture (PCAP)

Allows filtering on various attributes of the Ethernet frame to limit the amount of

 

data collected. You can capture packets of Ethernet frames going into or leaving an

 

SG appliance.

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Contents Blue Coat Systems SG Appliance Contact Information Contents Diagnostics Appendix a Glossary Index Volume 9 Managing the Blue Coat SG Appliance Document Conventions About Managing the SG ApplianceVolume 9 Managing the Blue Coat SG Appliance Automatically Registering the SG Appliance with Director Using Director to Manage SG SystemsTo register the appliance with a Director Related CLI Commands for Director RegistrationDirector Registration Requirements Registering the SG Appliance with DirectorTo view the fingerprint of the key Setting up Director and SG Appliance CommunicationTo view the system summary statistics Monitoring the System and DisksSystem Summary To delete a keyTo view the system environment statistics Viewing System Environment SensorsTo view disk status or take a disk offline Viewing Disk StatusTo view SSL accelerator cards Setting Up Event Logging and NotificationConfiguring Which Events to Log Viewing SSL Accelerator Card InformationEnabling Event Notification Setting Event Log SizeRelated CLI Commands for Setting the Event Logging Level Related CLI Commands to Set the Event Log SizeTo enable event notifications Related CLI Commands to Enable Event NotificationsSyslog Event Monitoring Related CLI Commands to Enable Syslog Monitoring Viewing Event Log Configuration and ContentViewing the Event Log Configuration To enable syslog monitoringViewing the Event Log Contents Enabling Snmp Configuring SnmpTo enable and configure Snmp Related CLI Commands to Enable and Configure SnmpTo set or change community strings Configuring Snmp Community StringsConfiguring Snmp Traps To enable Snmp trapsRelated CLI Commands for Enabling Snmp Traps Health Monitoring Requirements Configuring Health MonitoringAbout Health Monitoring About the Health Monitoring Metric TypesAbout License Expiration Metrics Health Monitoring ExampleAbout Health Monitoring Notification About the General MetricsAbout the Licensing Metrics Metric Threshold States and Corresponding Values About the Status MetricsTo change the threshold and notification properties Changing Threshold and Notification PropertiesGetting a Quick View of the SG Appliance Health To review the health monitoring statistics Viewing Health Monitoring StatisticsRelated CLI Syntax to View Health Monitoring Statistics TroubleshootingVolume 9 Managing the Blue Coat SG Appliance Restarting the SG Appliance Hardware and Software Restart OptionsTo restart the SG appliance Restore-Defaults Restoring System DefaultsKeep-Console Factory-DefaultsTo clear the DNS cache To restore system defaultsClearing the DNS Cache Clearing the Object CacheUpgrading the SG Appliance Troubleshooting TipClearing the Byte Cache Clearing Trend StatisticsTo upgrade the SG appliance SG Appliance 5.x Version UpgradeRelated CLI Syntax to Upgrade the Sgos Software To view Sgos system replacement options Managing SG Appliance SystemsTo view details for an Sgos system version Setting the Default Boot System Example SessionTo set the SG appliance to run on the next hardware restart To unlock a system Locking and Unlocking SG Appliance SystemsReplacing an SG Appliance System To lock a systemTo delete a system Deleting an SG Appliance SystemDisk Reinitialization Multi-Disk SG AppliancesTo delete multiple objects from the SG appliance Single-Disk SG ApplianceDeleting Objects from the SG Appliance To delete a single object from the SG applianceDiagnostics Diagnostic Reporting Service Information Sending Service Information AutomaticallyTo send service information automatically Managing the Bandwidth for Service Information Related CLI Syntax to Send Service InformationTo manage bandwidth for service information To send service information Configure Service Information SettingsSGOS#diagnostics service-info subcommands Creating and Editing Snapshot Jobs To create a new snapshot jobTo edit an existing snapshot job Related CLI Syntax to Edit an Existing Snapshot Job Following subcommands are availablePacket Capturing the Job Utility Pcap File Name FormatCommon Pcap Filter Expressions Using Filter Expressions in the CLI Configuring Packet CapturingTo enable, stop, and download packet captures Diagnostics Viewing Current Packet Capture Data Related CLI Syntax to Define Packet Capturing SettingsTo view current packet capture statistics To configure core image restart optionsCore Image Restart Options Uploading Packet Capture DataDiagnostic Reporting Heartbeats To set daily heartbeats and/or Blue Coat monitoringRelated CLI Syntax to Manage Heartbeats and Monitoring Diagnostic Reporting CPU Monitoring To configure and view CPU monitoringRelated CLI Syntax to Configure and View CPU Monitoring Volume 9 Managing the Blue Coat SG Appliance Selecting the Graph Scale StatisticsTraffic Mix Viewing Traffic Distribution StatisticsUnderstanding Chart Data Refreshing the DataAbout Bypassed Bytes About the Default Service Statistics Viewing Bandwidth Usage or GainTo view bandwidth usage or gain statistics Viewing Client Byte and Server Byte Traffic Distribution Viewing Traffic HistoryTo view client and server byte statistics Supported Proxy Types and Services Unsupported Proxy Types To view client and server byte or bandwidth gain statistics Viewing the ADN HistoryViewing Bandwidth Management Statistics Viewing Protocol StatisticsSSL History To view CPU utilization Viewing System StatisticsResources Statistics Viewing CPU UtilizationTo view concurrent users Viewing Concurrent UsersTo view memory use statistics Viewing Disk Use StatisticsViewing Memory Use Statistics To view disk use statisticsTo view data allocation statistics Viewing Data Allocation Statistics in RAM and on DiskContents Statistics To view the event log Event Logging StatisticsFailover Statistics Active Sessions-Viewing Per-Connection StatisticsTo view failover statistics To view proxied sessions Analyzing Proxied SessionsViewing Proxied Sessions About the Proxied Sessions StatisticsProvided. See Viewing Sessions with Multiple Connections on Cache Hit Is unavailable if the content is non-cacheable or for Cifs Using the Tool Tips About MMS Streaming ConnectionsViewing Sessions with Multiple Connections MMS Understanding the Tree ViewWhat Is Not Displayed Filtering the DisplayAbout the Byte Totals Analyzing Bypassed Connections Statistics Viewing Html and XML Views of Proxied Sessions DataViewing Bypassed Connections About the Bypassed Connection StatisticsTo view bypassed connections 14. Filter Drop-Down List Viewing Health Check Statistics Viewing the Access LogViewing Html and XML Views of Bypassed Connections Data Viewing Health Monitoring StatisticsUsing the CLI show Command to View Statistics Statistics Volume 9 Managing the Blue Coat SG Appliance Appendix a Glossary URL Appendix a Glossary Drtr Icmp Volume 9 Managing the Blue Coat SG Appliance MACH5 MIB NTP 100 Network Tunneling tab 102 103 104 Index 106 Snmp 108
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