====== TCP Analyzer ======

This article hepls you with providing guidelines to install and run the TCP Analyzer app in Trisul Network Analytics.

**
To Calculate and Analyze the latency from connection setup time, retransmissions, and timed-out flows. 
**

{{:tips:tcp-analyzer-app.png?200|}}

The App adds the following metrics to Trisul namely,
  * Per Host Latency for internal and external hosts. Setup time in microseconds.
  * Per Host Retransmission count for internal and external hosts. Number of retransmitted packets.
  * Per Host Retransmission Percent for internal and external hosts. % retransmitted vs total packets.
  * Per Host Poor Quality Flows : Number of flows with high retransmissions.
  * Per Host Mark Flow with bad BADQUALITY if timeout.

===== Installing =====

  * The app can be installed by logging in as Admin and selecting //Web Admin > Manage > Apps > TCP Analyzer//.
  * Restart the probes after installing the app.

{{:tips:tcp-analyzer-admin.png?600|}}

===== Viewing the data =====

This app shows data in three forms.They are
  * It adds a new Counter group called **TCP Analyzer**.
  * It can be viewed by selecting //Retro > Retro Counters//.

{{:tips:tcp-analyzer-counter.png?600|}}

Also,
  * It adds a new Flow Tracker called **POOR QUALITY**.
  * It can be viewed by selecting Tools > Flow Tracker. You have to select the Flow tracker as mentioned above.

{{:tips:tcp-analyzer-poorquality.png?600|}}

Also,
  * It adds a new Flow Tagger called **BAD QUALITY**.
  * The best method to see the flow tagger is by selecting Tools > Explore Flows. Enter expression as 'tag=BadQuality'.

{{:tips:tcp-analyzer-badquality.png?600|}}