Network analysis and troubleshooting
There is a handy new feature in Wireshark 2.6 that just made looking at one of my favorite trace files a little more interesting.The tcptrace graph has been used by analysts for years to graph the efficiency of data transfers over TCP. It helps us to see sequence number increase over time, the …
[Read more...] about Wireshark Quick Tip – Graphing TCP Zero Windows
Hey packet people!If you have ever had to analyze a TCP connection, you have definitely seen a three-way handshake. In that handshake, both TCP stacks will exchange the options they are open to use for the connection. In the options field, you may also see several instances of the No-Operation …
In this video we will take a look at the TCP Maximum Segment Size value and how it works, contrasting it with the Ethernet/IP MTU value. We will also take a look at why these values are different and how the network can adjust MSS along the path, and how that impacts each end of the …
In this video we will take a look at how the TCP Window Scaling option works. In short, this option allows a TCP receiver to advertise a receive window of up to 1GB. But how does this feature actually work? How does Wireshark come up with the Calculated Window Size value?This video will …
You drew the short straw.Over the next couple of weeks, while everyone else is skiing in some amazing place or finally taking that year-end time with their kids, you are left behind at the office to “monitor” the system.Unless you work for UPS or Amazon, it will most likely be a relaxed …
[Read more...] about Hey Network Engineers – What To Do While Everyone Is Gone
What does thatWindow field in the TCP header do?Many people ask this question after capturing a trace file with Wireshark. What is the TCP Window? How does it work? How can I use it to troubleshoot performance problems?We will answer these questions and more in this nine minute …
