06. 05. 2014 Luca Di Stefano Network Traffic Monitoring, Real User Experience Monitoring

Real User Experience – TCP Plugin

Until now, the NetEye Real User Experience was able to view the key performance indicators linked only to those applications that are using the http / https protocols.
The new TCP plugin allows to display KPI for all the applications that use the TCP protocol with a client request / server response model:

The plugin is able to extract information regardless of the application protocol implemented in the layer 7, if the communication model is the expected one, which in effect is the one used by most applications.

The qualitative information that the plugin can export are:

KPI Description
Client/Server network latency network latency on the client and server side
Application server latency processing time of the request, without network time
Load Time time elapsed from the client request to the last byte sent by the application, it represents the total time to get the complete response by the Application
Application Throughput application response speed
Network Throughput data rate
Retransmitted – OOO – Fragmented Packets out of sequence, retransmitted or fragmented packets
Receive window close how many times the client or the server has reported a situation of a received full buffer, and therefore it has not been able to quickly process the request
Reset connection reset situations based on communication errors

In addition to these qualitative values the TCP plugin can also collect quantitative data:

KPI Description
Bytes number of bytes transmitted from the client or server comprising the TCP stack header
Payload bytes only the bytes of the application request or response content
Packets number of packets sent from the client or server
Transfer time data transmission time (upload / download time)

SSL – TLS

The TCP plugin is able to provide the above KPIs also for the TCP communications that make use of SSL / TLS without having the need to install the private key in use. This allows you to track the performance of encrypted communications by third parties, for instance in the cloud.

To be able to combine in an application the ssl/tls flow is necessary to know the  ip / port of the provided service or alternatively the hostname / port and that the client uses the tls SNI ( service name indicator) extension.

The SNI extension is useful in cases where you control a service with many associated IPs and if these IPs are changing over time (i.e. cloud services). With SNI we can recognize the target service from the hostname / alias that the client uses to connect, and in this way we are independent from the changes of the IPs associated with the service.

This is an example of visualization of TCP data grouped by netgroups:

 

Luca Di Stefano

Luca Di Stefano

Solution Architect at Würth Phoenix
Hi everyone, I’m Luca, graduated in electrical engineering from the University of Bologna. I am employed by Würth Phoenix since its foundation. I worked mainly as enterprise architect and quality assurance engineer. Previously I was involved in systems measurement and embedded systems programming. I have gained experience on Unix (Solaris, HPUX), Windows, and C, C + +, Java. I personally contribute to the Open Source community as beta tester and developer. During my spare time I love piloting airplanes fly over the beautiful Alps. I practice many sports: tennis, broomball, skiing, alpine skiing, volleyball, soccer, mountain biking, middle distance, none have a sample but the competition excites me! I love hiking, tracking and traveling.

Author

Luca Di Stefano

Hi everyone, I’m Luca, graduated in electrical engineering from the University of Bologna. I am employed by Würth Phoenix since its foundation. I worked mainly as enterprise architect and quality assurance engineer. Previously I was involved in systems measurement and embedded systems programming. I have gained experience on Unix (Solaris, HPUX), Windows, and C, C + +, Java. I personally contribute to the Open Source community as beta tester and developer. During my spare time I love piloting airplanes fly over the beautiful Alps. I practice many sports: tennis, broomball, skiing, alpine skiing, volleyball, soccer, mountain biking, middle distance, none have a sample but the competition excites me! I love hiking, tracking and traveling.

Leave a Reply

Your email address will not be published. Required fields are marked *

Archive