Network analysis and troubleshooting
You just had that new 10Gbps+ WAN link installed. Woo! It finally gives you a massive link between your key locations and promises to deliver amazing performance. To give it a nice trial run, you find a file on a server on the opposite side and pull it over. Seems a little sluggish. So …
[Read more...] about Three Reasons Your File Transfers Are Slow
With each passing year, tech is moving faster and faster. To try to keep up with it all, every year I set a goal of technologies to learn (or reinforce). Usually it involves buying a book or two, plunking down in front of some video content, and of course, getting some sample trace files so I can …
[Read more...] about What I Plan to Read in 2019 – Networking, Protocols, and more
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 …
