Learn MSS for VServer | Citrix Systems CITRIX NETSCALER 9.3 instruction

Chapter 5 Advanced Configurations

•To create a TCP profile, click Add.

•To specify the MSS in an existing TCP profile, click the name of the profile, and then click Open.

3.In the Create TCP Profile or Configure TCP Profile dialog box, specify values for the following parameters, which correspond to the parameters described in "Parameters for specifying the MSS value in a TCP profile" as shown:

•Name*—name (cannot be changed for an existing TCP profile)

•MSS*—mss

* A required parameter

4.Click Create or OK.

Configuring the NetScaler to Learn the MSS Value from Bound Services

If you set the global TCP parameter learnVsvrMSS to ENABLED, the NetScaler appliance learns the most frequently used MSS value for each configured virtual server. When a client connects to a virtual server, the appliance advertises to the client the MSS value that is optimum for that virtual server. The optimum value is the MSS of the service or subset of bound services that are most frequently selected during load balancing. Consequently, each virtual server configuration uses its own MSS value. This enhancement enables the appliance to optimize the consumption of system resources.

The default value of the learnVsvrMSS parameter is DISABLED. When enabled, MSS learning is applicable only to virtual servers of type TCP, HTTP, and FTP.

To configure the NetScaler to learn the MSS for a virtual server by using the NetScaler command-line

At the NetScaler command prompt, type the following commands to configure the NetScaler to learn the MSS for a virtual server and verify the configuration:

wset ns tcpParam -learnVsvrMSS (ENABLEDDISABLED)

wshow ns tcpParam

Example

>set ns tcpParam -learnVsvrMSS ENABLED Done

>show ns tcpParam

TCP Parameters
Window Scaling status	: DISABLED
Window Scaling factor	: 4
SACK status	: DISABLED
Learn MSS for VServer	: ENABLED
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Citrix Systems CITRIX NETSCALER 9.3 manual Learn MSS for VServer

Contents

Citrix NetScaler Administration Guide Copyright and Trademark Notice Page Page Contents Snmp Vii Audit Logging Web Server Logging 105 Advanced Configurations Contents Web Interface AppFlow Reporting Tool Contents Xvi Formatting Conventions Meaning Boldface Formatting Conventions for NetScaler DocumentationThis Preface To view the documentation Documentation Available on the NetScaler ApplianceConvention To provide feedback at the Knowledge Center home Getting Service and SupportNetScaler Documentation Feedback Preface Authentication and Authorization Topics Show system user Example Configuring Users and GroupsConfiguring User Accounts Timeout CLI Idle Session Timeout Secs Parameters for configuring a user accountPassword Password UserName User Name Show system group Example Configuring User GroupsTo create a user group by using the NetScaler command line Show system group groupName Example GroupName Group Name Parameters for configuring a user groupShow system group groupName UserName CLI Prompt CLI Idle Session Timeout Secs Configuring Command PoliciesBuilt-in Command Policies Except show runningconfig, show Creating Custom Command PoliciesBuilt-in Command Policies Policy name Allows Runningconfig, and sh gslb Matches these commands Command specification regular expression Policyname Parameters for configuring a command policySh system cmdPolicy Example Action Binding Command Policies to Users and Groups Sh system user userName Parameters for binding a command policy to a userSh system user userName Example Priority Sh system group groupName Parameters for binding a command policy to a groupSh system group groupName Example GroupName Resetting the Default Administrator nsroot Password To reset the nsroot password Example of a User Scenario Fsck /dev/ad0s1a Mount /dev/ad0s1a /flash Configuration steps Sample Values for Creating Entities Field Configuring External User Authentication Configuring Ldap Authentication Bind DN Examples of Base Distinguished Name Ldap server Base DNExamples of Bind Distinguished Name Ldap server Authentication Type, select LDAP. Next to Server, click New Determining attributes in the Ldap directory Authentication Type, select Radius Configuring Radius AuthenticationChoosing Radius authentication protocols Configuring IP address extraction Authentication Type, select Tacacs Configuring TACACS+ AuthenticationConfiguring NT4 Authentication Authentication Type, select NT4 Authentication and Authorization Snmp Importing MIB Files to the Snmp Manager and Trap Listener Enabling or Disabling an Snmp Alarm Enable snmp alarm alarm name Sh snmp alarm alarm name Parameters for configuring Snmp alarms Configuring AlarmsTo configure an Snmp alarm by using the command line Severity To add an Snmp trap by using the NetScaler command line Configuring TrapsTo configure Snmp alarms by using the configuration utility Parameters for configuring Snmp traps To configure Snmp Traps by using the configuration utility Enabling Unconditional Snmp Trap Logging Parameters for unconditional Snmp trap logging Configuring the NetScaler for Snmp v1 and v2 QueriesSpecifying an Snmp Manager SnmpTrapLogging Snmp Trap Logging To add an Snmp manager by using the NetScaler command line Show snmp manager Parameters for configuring an Snmp manager IPAddress To add an Snmp manager by using the configuration utility Sh snmp community Parameters for configuring an Snmp community stringSpecifying an Snmp Community Permissions Community String*-communityName Configuring Snmp Alarms for Rate LimitingConfiguring an Snmp Alarm for Throughput or PPS Show snmp alarm PF-RL-RATE-THRESHOLD NormalValue Show snmp alarm PF-RL-PPS-THRESHOLDThresholdValue State Configuring Snmp Alarm for Dropped Packets Alarm Threshold-thresholdValue Normal Threshold-normalValue Configuring the NetScaler for SNMPv3 Queries Parameters for configuring an Snmp alarm for dropped packets Setting the Engine ID Parameters for setting the engine ID Configuring a ViewTo set the engine ID by using the NetScaler command line To set the engine ID by using configuration utility To add an Snmp group by using the NetScaler command line Configuring a GroupParameters for configuring an Snmp view To configure a user by using the NetScaler command line Configuring a UserParameters for configuring an Snmp group SecurityLevel Parameters for configuring an Snmp user Citrix NetScaler Administration Guide Snmp Audit Logging Audit Logging Show audit syslogAction name Configuring the NetScaler Appliance for Audit LoggingConfiguring Audit Servers ServerIP Parameters for configuring auditing serversShow audit nslogAction name ServerPort Log levels defined To configure a Syslog policy by using the command line Configuring Audit PoliciesTo configure an auditing server action Rule To configure an Nslog policy by using the command lineParameters for configuring audit policies Parameters for binding the audit policies globally To configure an audit server policyBinding the Audit Policies Globally Name* name Server* action To globally bind the audit policy Configuring Policy-Based LoggingConfiguring an Audit Message Action Pre Requisites LogtoNewnslog BypassSafetyCheckStringBuilderExpr Installing and Configuring the Nslog Server Binding Audit Message Action to a Policy Software requirements Installing Nslog Server on the Linux Operating SystemSupported Platforms for the Nslog Server Operating system Installing Nslog Server on the FreeBSD Operating System Pkginfo grep NSaudserver Pkgdelete NSaudserver To install Nslog server on a Windows operating system On the system, where you have downloaded the Nslog package Audserver -remove Nslog Server Command OptionsTo uninstall the Nslog server on a Windows operating system Audserver -stop To add the IP addresses of the NetScaler appliance Audserver -remove Specifies To start audit server logging Verifying the Nslog Server Configuration FileRunning the Nslog Server To create a filter Customizing Logging on the Nslog ServerCreating Filters Specifying Log Properties Default Settings for the Log Properties Sample Configuration File audit.conf Following is a sample configuration file Web Server Logging Configuring the NetScaler Appliance for Web Server Logging Enabling or Disabling Web Server Logging Sh weblogparam Example Modifying the Default Buffer SizeParameter for modifying the buffer size Buffer Size To modify the buffer size by using the configuration utility Supported Platforms for the Nswl Client Operating system Cp pathtocd/Utilities/weblog/Solaris/NSweblog.tar /tmp Installing Nswl Client on a Solaris Operating SystemHardware requirements Tar xvf NSweblog.tar Installing Nswl Client on a Linux Operating SystemCd /tmp Pkginfo grep NSweblog To get more information about the NSweblog RPM file Installing Nswl Client on a FreeBSD Operating SystemTo view the installed Web server logging files Cp pathtocd/Utilities/weblog/macos/NSweblog.tgz /tmp Installing Nswl Client on a Mac OS Operating SystemPkgdelete NSweblog Installing Nswl Client on a Windows Operating System To install the Nswl client on a Windows system Cp pathtocd/Utilities/weblog/AIX/NSweblog.rpm /tmp Installing Nswl Client on an AIX Operating SystemTo uninstall the Nswl client on a Windows system Rpm -i NSweblog.rpm Nswl Client Command Options Nswl Command Options Nswl command Specifies Nswl -addns -f directorypath \log.conf Adding the IP Addresses of the NetScaler ApplianceTo add the Nsip address of the NetScaler appliance Running the Nswl Client Verifying the Nswl Configuration FileTo verify the configuration in the Nswl configuration file Customizing Logging on the Nswl Client System Parameters for Creating a Filter Specifies On OFF To create a filter for a virtual server LogFormat Ncsa Understanding the Ncsa and W3C Log Formats Ncsa Common Log Format W3C Extended Log Format Ncsa Common Log Format Argument Specifies Directive Descriptions EntriesDirectives Prefix Descriptions Specifies FieldsIdentifiers Examples W3C Extended Log Format Identifiers No Prefix Required Description Field Description Creating a Custom Log Format by Using the Nswl LibraryCreating a Custom Log Format To create the custom log format by using the Nswl Library Creating a Custom Log Format Manually Sample Configuration File Creating Apache Log Formats Ncsa Arguments for Defining a Custom Log Format 11.Custom Log Format Argument Specifies Foobari Foobaro Formatt Time Format Definition 12.Time Format Definition Argument Specifies Argument Specifies 123 Web Server Logging 124 Advanced Configurations Show ntp server Example Configuring Clock SynchronizationTo add an NTP server by using the NetScaler command line Minpoll Parameters for configuring an NTP serverServerName Maxpoll Starting or Stopping the NTP Daemon Configuring Clock Synchronization ManuallyEnable ntp sync Disable ntp sync Viewing the System Date and Time Usr/sbin/ntpd -c /nsconfig/ntp.conf -l /var/log/ntpd.logShow ns config Example Configuring TCP Window Scaling WSVal Parameters for configuring window scalingShow ns tcpParam Example Configuring Selective Acknowledgment Enabled Clearing the Configuration To enable Sack by using the Configuration Utility Viewing the Http Band Statistics Parameters for clearing a configurationTo clear a configuration by using the configuration utility Level ReqBandSize RespBandSize To add an Http profile by using the NetScaler command line Configuring Http ProfilesTo modify the band range by using the configuration utility Built-in Http Profiles Built-in profile Description Parameters for adding an Http profile Built-in TCP Profiles Built-in profile Description Configuring TCP ProfilesTo add an Http profile by using the configuration utility To add a TCP profile by using the NetScaler command line Parameters for creating a TCP profile To add a TCP profile by using the configuration utility Specifying a TCP Buffer Size Example Parameters for setting the TCP buffer size in a TCP profile BufferSize Mss Specifying the MSS Value in a TCP ProfileParameters for specifying the MSS value in a TCP profile Learn MSS for VServer LearnVsvrMSS Advanced Configurations 148 Web Interface How Web Interface Works Prerequisites Installing the Web Interface JRE tar file path Configuring the Web InterfaceWeb Interface tar file path Parameters for configuring Web interface sites Access Gateway URL Gateway Direct ModeAuthentication Point Port XML Service Port Configuring a Web Interface Site for LAN Users Using HttpXML Service Addresses Transport A Web Interface Site Configured for LAN Users Using Http Site Type Published Resource Type Kiosk Mode Virtual Server Protocol select Https IP Address Port Add service WILoopbackService 127.0.0.1 Http Configuring a Web Interface Site for LAN Users Using Https A Web Interface Site Configured for LAN Users Using Https 160 161 Add lb vserver Httpswi SSL 10.102.29.3 Configuring a Web Interface Site for Remote Users Using Agee A Web Interface Site Configured for Remote Users Using Agee 165 166 AppFlow How AppFlow Works NetScaler Flow Sequence Flow Records Templates Configuring the AppFlow Feature Specifying a Collector Enabling or Disabling the AppFlow FeatureTo specify a collector by using the NetScaler command line To specify a collector by using the configuration utility Configuring an AppFlow ActionTo remove a collector by using the NetScaler command line Parameters for specifying a collector Comment Parameters for configuring an AppFlow actionCollectors Configuring an AppFlow Policy Show appflow policy name Parameters for configuring an AppFlow policy Rule Action To add an expression by using the Add Expression dialog box Http Binding an AppFlow Policy Show appflow global Invoke Invoke flag LabelType Parameters for binding an AppFlow policyGotoPriorityExpression LabelName Enabling AppFlow for Virtual Servers Click Apply Changes Enabling AppFlow for a Service Setting the AppFlow Parameters AppFlow Parameters HttpMethod HttpCookieHttpReferer HttpHost Reporting Tool Working with Reports Using the Reporting ToolTo invoke the Reporting tool Using Built-in Reports Creating and Deleting Reports Modifying the Time Interval Time Intervals Time interval Displays Setting the Data Source and Time Zone Exporting and Importing Custom Reports Modifying a Chart Working with ChartsAdding a Chart Viewing a Chart To change the graph type of a chart To view numeric data for a graph To change the color and graph type of a data set Examples Deleting a ChartTo export chart data to Excel Stopping and Starting the Data Collection Utility Limits on Entity Numbers Retrieved by nscollect Entity name Entity name Limit To stop nscollectTo start nscollect on the local system Netscaler/nscollect stop To start nscollect on the remote system Netscaler/nscollect start