August 2009
Intermediate to advanced
232 pages
5h 49m
English
Content preview from Deploying IPv6 in Broadband Access NetworksBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 2. IPv6 Overview
The IPv6 protocol evolved from years of operational experiences with the IPv4 protocol. In defining the IPv6 protocol, the networking industry and the IETF community tried to overcome real and perceived shortcomings of IPv4. A number of IETF RFCs cover currently defined capabilities of IPv6. Each RFC was defined after rigorous and long debate in the IETF. In this chapter we highlight some of the basics of IPv6 protocol, such as operations, addressing, and provisioning, all of which are important for engineers and architects who plan, design, and deploy IPv6 in access broadband networks. In this chapter we set the stage for technical deployment issues discussed in later chapters.
IPv6 PROTOCOL BASICS
IPv4 and IPv6 Header Comparison
In this section we briefly review the differences and similarities between the IPv4 and IPv6 headers and discuss the rationale behind the changes introduced into IPv6. IPv6 has a fixed 40-byte header encompassing eight fields. A quick look at Figure 2.1 shows that the IPv6 header inherits some fields from IPv4. Also, some fields are simply renamed, whereas others have been eliminated and new one(s) added.
The following fields in the IPv6 header are passed on from IPv4, including their original functions.
Version This is a 4-bit field that contains (0110) to indicate IPv6 instead of (0100), which was used for the IPv4 version.
Source Address A 32-bit field for IPv4, this is now a 128-bit field, to represent the larger IPv6 source address. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.