Book Image

Mastering Wireshark

Book Image

Mastering Wireshark

Overview of this book

Wireshark is a popular and powerful tool used to analyze the amount of bits and bytes that are flowing through a network. Wireshark deals with the second to seventh layer of network protocols, and the analysis made is presented in a human readable form. Mastering Wireshark will help you raise your knowledge to an expert level. At the start of the book, you will be taught how to install Wireshark, and will be introduced to its interface so you understand all its functionalities. Moving forward, you will discover different ways to create and use capture and display filters. Halfway through the book, you’ll be mastering the features of Wireshark, analyzing different layers of the network protocol, looking for any anomalies. As you reach to the end of the book, you will be taught how to use Wireshark for network security analysis and configure it for troubleshooting purposes.
Table of Contents (16 chapters)
Mastering Wireshark
About the Author
About the Reviewer

TCP stream graphs

There are a couple of graphs that come in this section. Each of them depicts the network traffic in a graphical form differently. Let's start by taking a look at each one of them.

Round-trip time graphs

Round-trip time (RTT) is the duration in which the ACK for a packet that is sent is received, that is, for every packet sent from a host, there is an ACK received (TCP communication), which determines the successful delivery of the packet. The total time that is consumed from the transfer of the packet to the ACK for the same is called round trip time. Follow these steps to create one for yourself:

  • Select any TCP packet in your packet list pane.

  • Navigate to Statistics | TCP Stream Graph | Round Trip Time Graph.

  • The x axis represents the TCP sequence number and the y axis represents the RTT in seconds.

  • Each plotted point on the graph represents the RTT of a packet. If you are not seeing anything in your graph, then you might have selected an opposite directional packet.

  • RTT graphs...