This test monitors the TCP protocol traffic to and from a server. Since most popular applications (Web servers, Citrix, Databases, Application servers, etc.) rely on the TCP protocol for their proper functioning, traffic monitoring at the TCP protocol layer can provide good indicators of the performance seen by the applications that use TCP. The most critical metric at the TCP protocol layer is the percentage of retransmissions. Since TCP uses an exponential back-off algorithm for its retransmissions, any retransmission of packets over the network (due to network congestion, noise, data link errors, etc.) can have a significant impact on the throughput seen by applications that use TCP.This page depicts the default parameters that need to be configured for the TcpTrafficTest.

• The TEST PERIOD list box helps the user to decide how often this test needs to be executed. 

• In the SEGMENTS_SENT_MIN text box, specify the minimum threshold for the number of segments sent/transmitted over the network. The default value is 25; in this case, the test will compute/report the Retransmit_ratio measure only if more than 25 segments are sent over the network – i.e., if the value of the Segments_sent measure crosses the value 25. On the other hand, if the Segments_sent measure reports a value less than 25, then the test will not compute/report the Retransmit_ratio measure. This is done to ensure that no false alerts are generated by the eG Enterprise system for the Retransmit_ratio measure. If you want the test to compute/report the Retransmit_ratio measure at all times irrespective of the number of segments sent/transmitted over the network, then set this parameter to -1. You can change this minimum threshold to any value of your choice.

• Once the above value is provided, clicking on the UPDATE button will register the changes made.