May 17, 2021
Intro to QUIC - More than just UDP!

This is the first in a series of posts about this rapidly emerging transport protocol. In this article we will explore how QUIC is different than TCP, which has been delivering reliable application connectivity for 40 years, and look at why it runs over UDP. The Basics QUIC is here. It has been for years. […]

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May 14, 2020
How TCP Works - Bytes in Flight

Let's look at the bytes in flight measurement in Wireshark and see how we can use it to troubleshoot slow file transfers. Enjoy!

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May 9, 2020
How TCP Works - The TCPTrace Graph

In my Wireshark courses we always spend time on the tcptrace graph. It is an excellent way to track down slowness in file transfers. However, interpreting it can be difficult, just because there is so much going on. In this video, we break down the tcptrace graph to learn how to use it to troubleshoot […]

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November 5, 2019
Top Five Commands - tshark, dumpcap

Hey packet heads! Let's talk about some commands for tshark and dumpcap. Last week I was working with one of my customers in troubleshooting a nagging intermittent performance problem. Of course, large capture files were needed to catch it in the act. That is well and good - until you start opening them up to […]

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August 13, 2019
How TCP Works - Stevens Graphs

In this video we will show how to use the TCP stream graphs. We will kick off with the TCP Stevens graph, which will display the increase of sequence number over time. It makes it easy to spot delays, or periods of time where the transfer hangs.

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June 4, 2019
How TCP Works - FINs vs Resets

Hey packet people! Just got a new TCP video out there on TCP FINs and Resets. The video talks about the difference between an orderly release of a TCP connection vs an abortive release. These two core TCP functions are very important to understand when troubleshooting. Please check it out!

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