Enabled | Citrix Systems CITRIX NETSCALER 9.3 specification

Chapter 5 Advanced Configurations

To configure window scaling by using the configuration utility

1.In the navigation pane, expand System, and then click Settings.

2.In the details pane, under Settings, click Configure TCP Parameters.

3.In the Configure TCP Parameters dialog box, under TCP, select the Windows Scaling check box to enable window scaling.

4.In the Factor text box, type a windows scaling factor (for example, 6). For possible values, see “Parameters for configuring window scaling.”

5.Click OK.

A message appears in the status bar, stating that window scaling has been configured successfully.

Configuring Selective Acknowledgment

NetScaler appliances support Selective Acknowledgment (SACK), as defined in RFC 2018. Using SACK, the data receiver (either a NetScaler or a client) notifies the sender about all the segments that have been received successfully. As a result, the sender (either a NetScaler or a client) needs to retransmit only those segments that were lost during transmission. This improves the performance of data transmission. SACK is important in long fat networks (LFNs). By default, SACK is disabled.

To enable Selective Acknowledgment (SACK) by using the NetScaler command line

At the NetScaler command prompt, type the following commands to enable Selective Acknowledgment (SACK) and verify the configuration:

wset ns tcpParam [-SACK ( ENABLED DISABLED )]

wshow ns tcpParam

Example

>set ns tcpParam -SACK ENABLED Done

>show ns tcpParam

TCP Parameters
Window Scaling status	: ENABLED
Window Scaling factor	: 4
SACK status	: ENABLED
MaxBurst setting	: 6	MSS
Initial cwnd setting	: 4	MSS
TCP Receive Buffer	: 8190 bytes
TCP Delayed-ACK Timer	: 200 millisec

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Citrix Systems CITRIX NETSCALER 9.3 manual Configuring Selective Acknowledgment, Enabled

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 for NetScaler Documentation This PrefaceFormatting Conventions Meaning Boldface Documentation Available on the NetScaler Appliance ConventionTo view the documentation Getting Service and Support NetScaler Documentation FeedbackTo provide feedback at the Knowledge Center home Preface Authentication and Authorization Topics Configuring Users and Groups Configuring User AccountsShow system user Example Parameters for configuring a user account Password PasswordTimeout CLI Idle Session Timeout Secs UserName User Name Configuring User Groups To create a user group by using the NetScaler command lineShow system group Example Show system group groupName Example Parameters for configuring a user group Show system group groupNameGroupName Group Name UserName Configuring Command Policies Built-in Command PoliciesCLI Prompt CLI Idle Session Timeout Secs Creating Custom Command Policies Built-in Command Policies Policy name AllowsExcept show runningconfig, show Runningconfig, and sh gslb Matches these commands Command specification regular expression Parameters for configuring a command policy Sh system cmdPolicy ExamplePolicyname Action Binding Command Policies to Users and Groups Parameters for binding a command policy to a user Sh system user userName ExampleSh system user userName Priority Parameters for binding a command policy to a group Sh system group groupName ExampleSh system group groupName 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 Examples of Base Distinguished Name Ldap server Base DN Examples of Bind Distinguished Name Ldap serverBind DN Authentication Type, select LDAP. Next to Server, click New Determining attributes in the Ldap directory Configuring Radius Authentication Choosing Radius authentication protocolsAuthentication Type, select Radius Configuring IP address extraction Configuring TACACS+ Authentication Configuring NT4 AuthenticationAuthentication Type, select Tacacs 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 Configuring Alarms To configure an Snmp alarm by using the command lineParameters for configuring Snmp alarms Severity Configuring Traps To configure Snmp alarms by using the configuration utilityTo add an Snmp trap by using the NetScaler command line Parameters for configuring Snmp traps To configure Snmp Traps by using the configuration utility Enabling Unconditional Snmp Trap Logging Configuring the NetScaler for Snmp v1 and v2 Queries Specifying an Snmp ManagerParameters for unconditional Snmp trap logging 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 Parameters for configuring an Snmp community string Specifying an Snmp CommunitySh snmp community Permissions Configuring Snmp Alarms for Rate Limiting Configuring an Snmp Alarm for Throughput or PPSCommunity String*-communityName Show snmp alarm PF-RL-RATE-THRESHOLD Show snmp alarm PF-RL-PPS-THRESHOLD ThresholdValueNormalValue 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 Configuring a View To set the engine ID by using the NetScaler command lineParameters for setting the engine ID To set the engine ID by using configuration utility Configuring a Group Parameters for configuring an Snmp viewTo add an Snmp group by using the NetScaler command line Configuring a User Parameters for configuring an Snmp groupTo configure a user by using the NetScaler command line SecurityLevel Parameters for configuring an Snmp user Citrix NetScaler Administration Guide Snmp Audit Logging Audit Logging Configuring the NetScaler Appliance for Audit Logging Configuring Audit ServersShow audit syslogAction name Parameters for configuring auditing servers Show audit nslogAction nameServerIP ServerPort Log levels defined Configuring Audit Policies To configure an auditing server actionTo configure a Syslog policy by using the command line To configure an Nslog policy by using the command line Parameters for configuring audit policiesRule To configure an audit server policy Binding the Audit Policies GloballyParameters for binding the audit policies globally Name* name Server* action Configuring Policy-Based Logging Configuring an Audit Message ActionTo globally bind the audit policy Pre Requisites BypassSafetyCheck StringBuilderExprLogtoNewnslog Installing and Configuring the Nslog Server Binding Audit Message Action to a Policy Installing Nslog Server on the Linux Operating System Supported Platforms for the Nslog Server Operating systemSoftware requirements 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 Nslog Server Command Options To uninstall the Nslog server on a Windows operating systemAudserver -remove Audserver -stop To add the IP addresses of the NetScaler appliance Audserver -remove Specifies Verifying the Nslog Server Configuration File Running the Nslog ServerTo start audit server logging Customizing Logging on the Nslog Server Creating FiltersTo create a filter 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 Modifying the Default Buffer Size Parameter for modifying the buffer sizeSh weblogparam Example Buffer Size To modify the buffer size by using the configuration utility Supported Platforms for the Nswl Client Operating system Installing Nswl Client on a Solaris Operating System Hardware requirementsCp pathtocd/Utilities/weblog/Solaris/NSweblog.tar /tmp Installing Nswl Client on a Linux Operating System Cd /tmpTar xvf NSweblog.tar Pkginfo grep NSweblog Installing Nswl Client on a FreeBSD Operating System To view the installed Web server logging filesTo get more information about the NSweblog RPM file Installing Nswl Client on a Mac OS Operating System Pkgdelete NSweblogCp pathtocd/Utilities/weblog/macos/NSweblog.tgz /tmp Installing Nswl Client on a Windows Operating System To install the Nswl client on a Windows system Installing Nswl Client on an AIX Operating System To uninstall the Nswl client on a Windows systemCp pathtocd/Utilities/weblog/AIX/NSweblog.rpm /tmp Rpm -i NSweblog.rpm Nswl Client Command Options Nswl Command Options Nswl command Specifies Adding the IP Addresses of the NetScaler Appliance To add the Nsip address of the NetScaler applianceNswl -addns -f directorypath \log.conf Verifying the Nswl Configuration File To verify the configuration in the Nswl configuration fileRunning the Nswl Client 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 Entries DirectivesDirective Descriptions Fields IdentifiersPrefix Descriptions Specifies Examples W3C Extended Log Format Identifiers No Prefix Required Description Creating a Custom Log Format by Using the Nswl Library Creating a Custom Log FormatField Description 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 Configuring Clock Synchronization To add an NTP server by using the NetScaler command lineShow ntp server Example Parameters for configuring an NTP server ServerNameMinpoll Maxpoll Configuring Clock Synchronization Manually Enable ntp sync Disable ntp syncStarting or Stopping the NTP Daemon Usr/sbin/ntpd -c /nsconfig/ntp.conf -l /var/log/ntpd.log Show ns config ExampleViewing the System Date and Time Configuring TCP Window Scaling Parameters for configuring window scaling Show ns tcpParam ExampleWSVal Configuring Selective Acknowledgment Enabled Clearing the Configuration To enable Sack by using the Configuration Utility Parameters for clearing a configuration To clear a configuration by using the configuration utilityViewing the Http Band Statistics Level ReqBandSize RespBandSize Configuring Http Profiles To modify the band range by using the configuration utilityTo add an Http profile by using the NetScaler command line Built-in Http Profiles Built-in profile Description Parameters for adding an Http profile Configuring TCP Profiles To add an Http profile by using the configuration utilityBuilt-in TCP Profiles Built-in profile Description 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 Specifying the MSS Value in a TCP Profile Parameters for specifying the MSS value in a TCP profileMss Learn MSS for VServer LearnVsvrMSS Advanced Configurations 148 Web Interface How Web Interface Works Prerequisites Installing the Web Interface Configuring the Web Interface Web Interface tar file pathJRE tar file path Parameters for configuring Web interface sites Gateway Direct Mode Authentication PointAccess Gateway URL Port Configuring a Web Interface Site for LAN Users Using Http XML Service AddressesXML Service Port 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 Enabling or Disabling the AppFlow Feature To specify a collector by using the NetScaler command lineSpecifying a Collector Configuring an AppFlow Action To remove a collector by using the NetScaler command lineTo specify a collector by using the configuration utility Parameters for specifying a collector Parameters for configuring an AppFlow action CollectorsComment 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 Parameters for binding an AppFlow policy GotoPriorityExpressionInvoke Invoke flag LabelType LabelName Enabling AppFlow for Virtual Servers Click Apply Changes Enabling AppFlow for a Service Setting the AppFlow Parameters AppFlow Parameters HttpCookie HttpRefererHttpMethod HttpHost Reporting Tool Using the Reporting Tool To invoke the Reporting toolWorking with Reports 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 Working with Charts Adding a ChartModifying 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 Deleting a Chart To export chart data to ExcelExamples Stopping and Starting the Data Collection Utility Limits on Entity Numbers Retrieved by nscollect Entity name To stop nscollect To start nscollect on the local systemEntity name Limit Netscaler/nscollect stop To start nscollect on the remote system Netscaler/nscollect start