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Packet Loss, Retransmissions, and Duplicate Acknowledgements


This is the third article of this TCP series, covering all you need to know to troubleshoot performance problems impacting business critical applications.

After considering How TCP opens and closes connections, we will now examine problems that can happen to a connection in progress.

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Topics: performance diagnostic, Network troubleshooting, TCP, network analysis

Why is DNS used and what are the main types of DNS queries?



INTRODUCTION:

Here is a first article of a series covering some important aspects to know about the DNS protocol when troubleshooting applications performance issues.

First of all, let’s have a look at the DNS protocol itself.

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Topics: DNS

How to diagnose TCP Session Closing and disconnections



TCP Series #2: TCP Closing a SESSION

Here is a second article of a series covering all you need to know to troubleshoot performance issues impacting applications relying on the TCP Protocol.

After studying how TCP sessions are established we will now see what can go wrong when closing a TCP sessions. 

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Topics: performance diagnostic, Network troubleshooting, TCP, network analysis

How to Avoid The ShelfWare Syndrome?



Do you know that?  

  • "93% of the organizations are wasting piles of money on unused or underused application software, otherwise known as « shelfware ».  
  • "20% of the organizations reported a loss over 1m$." (source: Flexera)
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Topics: Monitoring

How to diagnose TCP Connection set up issues


TCP Series #1: What can go wrong in a TCP Handshake?

Here is a first article of a series covering all you need to know to troubleshoot performance issues impacting applications relying on the TCP Protocol. 

Let's have a look at how TCP sessions are established... and what can go wrong! 

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Topics: TCP

How to get Network Visibility for Free



Performance Vision offers end-to-end application performance analytics from the wire-data. Because we know network engineers sometime get a hard time convincing their management to invest into network visibility / NMS / Network monitoring tools, we decided to provide a version of our Wire Data analytics solution for free! 

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Topics: NPM

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