Application Delivery Management

TCP Insight

The TCP Insight feature of NetScaler Console provides an easy and scalable solution for monitoring the metrics of the optimization techniques and congestion control strategies (or algorithms) used in NetScaler appliances to avoid network congestion in data transmission. This feature uses “TCP Speed Report” capability, which measures TCP file download or upload performance with and without TCP optimization.

You can view the key Transport Layer metrics, such as data volume, throughput, and speed, and use that information to measure the traffic volume served by the NetScaler instances and validate the benefits of TCP Optimization. Breakdowns by stream direction (from client to NetScaler and NetScaler to origin server), TCP port, and virtual LAN are provided for the above metrics.


Before you begin configuring the TCP Insight feature, make sure that the following prerequisites are met:

  • The NetScaler instances are running on software version 11.1 build 51.21 or later.

  • You have installed NetScaler Console running on software version 11.1 build 51.21 or later.

  • All the virtual servers configured for an application are licensed for management and monitoring on NetScaler Console.
    For information about NetScaler Console licensing, see Licensing.

Enabling TCP Insight

Before you can view the TCP Insight metrics, you must enable the feature on NetScaler Console.

To Enable TCP Insight:

  1. In a web browser, type the IP address of the NetScaler Console virtual appliance (for example,

  2. In User Name and Password, enter the administrator credentials.

  3. Navigate to Settings > Analytics Settings, and click Enable Features for Analytics.

  4. On the Enable Features for Analytics page, select Enable TCP Insight.

  5. In the confirmation window, click OK.

View the TCP Insight metrics in NetScaler Console

After enabling TCP Insight in NetScaler Console, you can view key transport layer information such as traffic mode (internet or mobile data), data volume, throughput, interfaces, ports, average upload speed, average download speed.

To display TCP Insight metrics in NetScaler Console:

Navigate to Infrastructure > TCP Insight.

You can hover your mouse pointer on the bar graphs to view the data volume of the corresponding transport techniques. Also you can view the data volume, and other metrics, in the table below the graph.

Note You can customize the metrics displayed in the graph by using the settings icon on the table. You can also select the time period to which the metrics pertain, and use the time slider adjust the time period.

You can also view metrics for such things as interfaces, ports, and bit rates by selecting from the TCP Insight list.

Use cases

The following use cases illustrate some of the ways to use TCP Insight on NetScaler appliances:

  • Assess benefits of TCP optimization

  • Tune TCP parameters

  • Measure impact of TCP optimization on traffic volume

Assess benefits of TCP optimization

How much does NetScaler TCP optimization actually benefit a mobile (radio) or enterprise network (internet). You can view the speed of data transfers that take place over TCP, and compare unoptimized and optimized performance. These measurements are displayed separately for the download and upload directions (always on the radio/client side), and for different destination ports, HTTP (80) and HTTPS (443). By examining the TCP Insight metrics, you can quantify the speed improvement gained by optimizing TCP flows.

To see a summary of these parameters, log on to NetScaler Console and click the TCP Insight tab. Then, click Sides and select Internet or Radio from the bar graph or the table below the graph.

TCP optimization

Tune TCP parameters

Using different TCP Profiles might yield different outputs for the same traffic. In such situations, you might want to view and compare the speed measurements of periods in which NetScaler is running different TCP optimization profiles. You can use the results to tune TCP parameters for faster transmission, and develop a TCP profile that maximizes the user-perceived experience in a specific customer network.

To view the reports, log on to NetScaler Console. Then, on the TCP Insight tab, click Bitrates, and select the desired bitrate from the bar graph or the table below the graph.

TCP parameters

Measure impact of TCP optimization on traffic volume

Measurements of IP-layer Data Volume/Throughput handled by a NetScaler instance can be compared between different time periods, to evaluate the effect of TCP optimization on subscriber data consumption. The measurements can be applied separately for each side of the network (radio-side vs. internet-side), for different traffic segments (delineated by different interfaces or VLANs), for each direction (downlink vs. uplink) and for different destination ports (HTTP and HTTPS). The comparison can be used to confirm that TCP optimization encourages subscribers to consume more data.

For a summary of the measurements, log on to NetScaler Console, and on the TCP Insight tab click Sides, and then select Internet or Radio from the bar graph or the table below the graph.

You can also select a different timeframe from the time list. You can customize the time frame by using the timeframe slider.

TCP traffic volume

TCP Insight