Information Technology Reference
In-Depth Information
Table 8.7
IPv6 address space known prefixes and addresses
Address Prefix
Scope of Use
2000:: /3
Global unicast space prefix
FE80:: /10
Link-local address prefix
FC00:: /7
Unique local unicast prefix
FD00:: /8
Unique local unicast prefix
FF00:: /8
Multicast prefix
2001:DB8:: /32
Global unicast prefix used for documentation
::1
Reserved local loopback address
2001:0000: /32
Teredo prefix (discussed later in this chapter)
2002:: /16
6to4 prefix
IPv6 Integration/Migration
It's time to get into the mind-set of integrating IPv6 into your existing infrastructure with
the longer goal of migrating to IPv6. In other words, this is not going to be an “OK, Friday
the Internet is changing over” rollout. You have to bring about the change as a controlled
implementation. It could easily take three to five years before a solid migration occurs and
probably longer. I think the migration will take slightly less time than getting the world to
migrate to the metric system on the overall timeline. The process of integration/migration
consists of several mechanisms.
Dual Stack
Simply running both IPv4 and IPv6 on the same network, utilizing the IPv4
address space for devices using only IPv4 addresses and utilizing the IPv6 address space for
devices using IPv6 addresses
Tunneling
Using an encapsulation scheme for transporting one address space inside
another
Address Translation
Using a higher-level application to change one address type (IPv4
or IPv6) to the other transparently so that end devices are unaware one address space is
talking to another
I elaborate on these three mechanisms in the following sections.
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