Book Image

Learn Wireshark, - Second Edition

By : Lisa Bock
5 (1)
Book Image

Learn Wireshark, - Second Edition

5 (1)
By: Lisa Bock

Overview of this book

Wireshark is a popular and powerful packet analysis tool that helps network administrators investigate latency issues and potential attacks. Over the years, there have been many enhancements to Wireshark’s functionality. This book will guide you through essential features so you can capture, display, and filter data with ease. In addition to this, you’ll gain valuable tips on lesser-known configuration options, which will allow you to complete your analysis in an environment customized to suit your needs. This updated second edition of Learn Wireshark starts by outlining the benefits of traffic analysis. You’ll discover the process of installing Wireshark and become more familiar with the interface. Next, you’ll focus on the Internet Suite and then explore deep packet analysis of common protocols such as DNS, DHCP, HTTP, and ARP. The book also guides you through working with the expert system to detect network latency issues, create I/O and stream graphs, subset traffic, and save and export captures. Finally, you’ll understand how to share captures using CloudShark, a browser-based solution for analyzing packet captures. By the end of this Wireshark book, you’ll have the skills and hands-on experience you need to conduct deep packet analysis of common protocols and network troubleshooting as well as identify security issues.
Table of Contents (28 chapters)
1
Part 1 Traffic Capture Overview
6
Part 2 Getting Started with Wireshark
11
Part 3 The Internet Suite TCP/IP
16
Part 4 Deep Packet Analysis of Common Protocols
21
Part 5 Working with Packet Captures

Exploring IPv6

Early on, scientists realized that IPv4's 32-bit address space would be exhausted. Although no one had an exact date, plans were made to replace IPv4 with an improved version, IPv6. In 1998, the RFC for IPv6 was published and can be found at https://www.ietf.org/rfc/rfc2460.txt.

IPv6 has a number of enhancements, including the following.

  • Streamlined header: The header has fewer fields; however, it is larger, mainly due to the expanded address space.
  • Flow label: In IPv6, there is a flow label. The field value is available for identifying streams that require specialized treatment, such as real-time traffic.
  • Support for extensions and options: While IPv4 can add options, IPv6 does so with greater ease. IPv6 provides the ability to add options, such as fragmentation, which has parameters to fragment the data, and hop-by-hop, which ensures that all devices in the path read the option.

The IPv6 header has room for larger address spaces. However...