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)

Introduction

DNS is a name resolution protocol that is used to resolve domain names to IP addresses. The internet is nothing more than a collection of network domains connected together with unique IP addresses as the identifier. It is not practically possible to remember each domain or the device based on an IP address. Instead, it is lot easier to remember the domains using names, and use some dynamic way of converting the names to an IP address.

DNS is a distributed client/server-based communication model. DNS is an application layer protocol where the client will send a DNS query carrying the domain name to the server, which in turn will respond with a DNS response for the respective IP address associated with the domain name. DNS runs on UDP port number 53. The server will maintain a database with a unique domain name and the associated IP addresses. The database can maintain...