Book Image

Network Analysis using Wireshark 2 Cookbook - Second Edition

By : Nagendra Kumar Nainar, Yoram Orzach, Yogesh Ramdoss
Book Image

Network Analysis using Wireshark 2 Cookbook - Second Edition

By: Nagendra Kumar Nainar, Yoram Orzach, Yogesh Ramdoss

Overview of this book

This book contains practical recipes on troubleshooting a data communications network. This second version of the book focuses on Wireshark 2, which has already gained a lot of traction due to the enhanced features that it offers to users. The book expands on some of the subjects explored in the first version, including TCP performance, network security, Wireless LAN, and how to use Wireshark for cloud and virtual system monitoring. You will learn how to analyze end-to-end IPv4 and IPv6 connectivity failures for Unicast and Multicast traffic using Wireshark. It also includes Wireshark capture files so that you can practice what you’ve learned in the book. You will understand the normal operation of E-mail protocols and learn how to use Wireshark for basic analysis and troubleshooting. Using Wireshark, you will be able to resolve and troubleshoot common applications that are used in an enterprise network, like NetBIOS and SMB protocols. Finally, you will also be able to measure network parameters, check for network problems caused by them, and solve them effectively. By the end of this book, you’ll know how to analyze traffic, find patterns of various offending traffic, and secure your network from them.
Table of Contents (20 chapters)

Troubleshooting TCP connectivity problems

When two TCP processes wish to communicate, they open the connection, send the data, and then close the connection. This happens when you open a browser to the internet and connect from your mail client to the mail server, or with Telnet to your router or any other application that works over TCP.

When TCP opens the connection, it sends a request for open connection from the source port to the destination port. Some problems can occur during the establishment or closing of the application. Using Wireshark to locate and solve these problems is the goal of this recipe.

Getting ready

If you experience one of the following problems, use Wireshark in order to find out what the reason for...