Agents Administration - Tests
 

Default Parameters for WVDTcpTrafficTest

Since most popular applications 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 test monitors the TCP protocol traffic to and from an Azure Virtual Desktop, and particularly monitors retransmissions.

This page depicts the default parameters that need to be configured for the WVDTcpTrafficTest.

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

  • Specify the minimum threshold for the number of segments sent/transmitted over the network against the SEGMENTS SENT MIN parameter. The default value is 10; in this case, the test will compute/report the TCP retransmit ratio measure only if more than 10 segments are sent over the network. On the other hand, if less than 10 segments are sent, then the test will not compute/report the TCP retransmit ratio measure. This is done to ensure that no false alerts are generated by the eG Enterprise system for the TCP retransmit ratio measure. You can change this minimum threshold to any value of your choice.

  • By default, the TRACE flag is set to No. This indicates that the test does not report any detailed diagnostics by default. However, if unusually high TCP traffic is flowing into the Azure virtual desktop , then you may want to know where this traffic is coming from. For deep-dive insights into the incoming TCP traffic of the target virtual desktop, you need to enable the detailed diagnosis capability of the test. For this, set the TRACE flag is set to Yes.

    Note:

    This test will report detailed metrics only if the TRACE flag is set to Yes and the DETAILED DIAGNOSIS flag is set to On. If either or both these flags are turned off, then the test will not report detailed statistics.

  • The EVENT CAPTURE INTERVAL IN SECS parameter is applicable only when the Trace flag is set to Yes and the Detailed Diagnosis flag is set to On. By default, the value of this parameter is set to 30 seconds. This setting ensures that the detailed diagnosis of the test reports on only the TCP traffic that flows into the virtual desktop during the last 30 seconds of a measurement period. However, you can override the default value of this parameter as per your requirement.

  • Once the above values are provided, click on the UPDATE button to register the changes made.

When changing default configurations of tests, the values with “$” indicate variables that will be replaced by the eG system according to the specific server being managed - for instance, $hostName is the host/nickname of the target host, $port is the port number of the server being monitored. E.g., for a server xyz:80, $hostName will be changed automatically by the eG manager to “xyz*” and $port will be changed to “80” when configuring a test.