July 2002
Beginner
360 pages
11h 19m
English
Content preview from IPv6 Essentials
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,
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.
Format Prefixes
RFC 2373 lists a number of format prefixes (also called global routing prefixes) that are used to identify special addresses, such as link-local addresses or multicast addresses. Table 3-2 outlines the initial assignment of reserved prefixes. The major part of the address space (over 80 percent) is unassigned, which leaves room for future assignments.
Table 3-2. List of assigned prefixes
|
Allocation |
Prefix binary |
Prefix hex |
Fraction of address space |
|---|---|---|---|
|
Reserved |
0000 0000 |
::0/128 |
1/256 |
|
Reserved for NSAP allocation Reserved for IPX allocation (deprecated in later draft) |
0000 001 0000 010 |
1/128 1/128 | |
|
Aggregatable global unicast addresses |
001 |
1/8 | |
|
Link-local unicast addresses Site-local unicast addresses |
1111 1110 10 1111 1110 11 |
FE80::/10 FEC0::/10 |
1/1024 1/1024 |
|
Multicast addresses |
1111 1111 |
FF00::/8 |
1/256 |
Some special addresses are assigned out of the reserved address space with the binary prefix 0000 0000. These include the unspecified address, the loopback address, and IPv6 addresses with embedded IPv4 addresses, which will be discussed in detail later in this chapter. In drafts released after RFC 2373, the prefix for IPX has been removed. (The most recent draft, at the time of writing, is available at http://www.ietf.org/internet-drafts/draft-ietf-ipngwg-addr-arch-v3-08.txt.)
Unicast addresses can be distinguished from multicast addresses by their prefix. Globally unique unicast addresses have a high-order byte starting with 001. An IPv6 ...
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.