May 2006
Beginner to intermediate
436 pages
14h 48m
English
Content preview from IPv6 Essentials, 2nd EditionBecome 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,
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.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.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.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.
Chapter 6. Quality of Service
In the beginning, the Internet was designed to be a simple communications platform, mainly used to support file transfer and email. Over the past 25+ years, it has grown to be a very complex global communications infrastructure with a multitude of applications and services. IPv4 is based on a simple packet switching model, delivering packets with best effort and no guarantee for delivery. TCP adds guaranteed delivery but has no options to control parameters such as delay and jitter or to do bandwidth allocation.
Emerging multimedia services (such as Voice over IP and videoconferencing) can have significant bandwidth demands and are often very sensitive to timely delivery. The Type of Service Byte (ToS) in the IPv4 header was designed to provide prioritized treatment of certain traffic. However, it was never widely implemented, one reason being that its use would delay the forwarding of packets on routers. As there were almost no real-time services in those days, there was little pressure to find better solutions.
The development of IPv6, combined with the growing demand for real-time services—and, therefore, Quality of Service (QoS) features—was an opportunity to look for other solutions. Despite the availability of several different approaches, the topic of QoS is still a matter of research, and there are many ideas under development.
This chapter aims to discuss the features in IPv6 that support QoS.
QoS Basics
The current IP model treats all packets ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.