Connection Delinks or Terminates Test

Whenever multiple connections are established to the NetScaler appliance, it is the onus of the administrators to keep track of the connections, figure out the connections that were delinked, connections that were terminated etc. When a TCP connection between the client side and server side delinks after a response is sent from the NetScaler device, that particular server connection can be reused for another client. This helps administrators to effectively utilize the connections to the NetScaler device. For an administrator to keep tab on the efficiency of the NetScaler device based on the connections that are established, the Connection delinks or Terminates test is the best bet to rely upon!

This test helps administrators to figure out the number of server and client TCP conenctions that are delinked, the connections that are terminated, the number of TCP connections for RNAT that are delinked etc.

For this test to run and report metrics, the NetScaler appliance should be configured to create a Syslog file in a remote Syslog server, where the details of all interactions with the NetScaler appliance will be logged. To know how to configure a remote Syslog server for the use of the NetScaler appliance, refer to Creating a Syslog file in a remote Syslog server topic.

This test is disabled by default. To enable the test, follow the Agents -> Tests -> Enable/Disable menu sequence in the eG administrative interface, pick Citrix NetScaler VPX/MPX as the Component type, select Performance as the Test type, choose this test from the list of disabled tests list, and click on the < button.

Target of the test : A NetScaler VPX/MPX

Agent deploying the test : A remote agent

Outputs of the test : One set of results for the NetScaler appliance being monitored.

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed

Host

The IP address of the host for which the test is being configured.

Port

The port at which the host listens. By default, this is NULL.

Log File Path

This test reports metrics by parsing a Syslog file. Specify the full path to the Syslog file here.

Search String

By default, the Syslog file may contain information relating to a number of servers that are inter linked with the target NetScaler appliance. In order to obtain the metrics of the target NetScaler appliance alone, specify the hostname or the IP address of the target NetScaler appliance for which the logs are to be read from the syslog file, in the Search String text box. Using this search string the information in the Syslog file may be parsed and metrics may be collected.

Search String Index

Here, specify the cursor position after which the eG agent should search for the specified Search String (or the position up to which the eG agent should ignore while searching for the specified Search String) in the syslog file. For example, if the specified Search String appears in the syslog file at the 17th position, then you may need to specify the Search String as 16.

DD Frequency

Refers to the frequency with which detailed diagnosis measures are to be generated for this test. The default is 1:1. This indicates that, by default, detailed measures will be generated every time this test runs, and also every time the test detects a problem. You can modify this frequency, if you so desire. Also, if you intend to disable the detailed diagnosis capability for this test, you can do so by specifying none against DD Frequency.

Detailed Diagnosis

To make diagnosis more efficient and accurate, the eG Enterprise embeds an optional detailed diagnostic capability. With this capability, the eG agents can be configured to run detailed, more elaborate tests as and when specific problems are detected. To enable the detailed diagnosis capability of this test for a particular server, choose the On option. To disable the capability, click on the Off option.

The option to selectively enable/disable the detailed diagnosis capability will be available only if the following conditions are fulfilled:

  • The eG manager license should allow the detailed diagnosis capability
  • Both the normal and abnormal frequencies configured for the detailed diagnosis measures should not be 0.
Measurements made by the test
Measurement Description Measurement Unit Interpretation

Connection delinks

Indicates the number of times the server side and client side connections are delinked after the response is sent from the NetScaler device.

Number

By default, connections like HTTP are tracked by the NetScaler device.

The detailed diagnosis of this measure if enabled, lists the Source IP, vServer, NAT IP, Destination IP, Delink time, Data sent and Data received.

Other connection delinks

Indicates the number of times the server side and client side TCP connections were delinked.

Number

These are connections like FTP, Telnet etc that are not tracked by the NetScaler device.

Connection terminates

Indicates the number of times the TCP connection was terminated.

Number

The detailed diagnosis of this measure if enabled lists the Source IP, Destination IP, the start time, the end time, the data sent and data received.

NAT connection delinks

Indicates the number of times the server side and client side TCP connection for RNAT was delinked.

Number

 

NAT other connection delinks

Indicates the number of times the server side and client side TCP connection that are not tracked by the NetScaler device for RNAT was delinked.

Number

These are connections that are not tracked by the NetScaler device.