Novell LINUX ENTERPRISE SERVER 10 SP2 - INSTALLATION AND ADMINISTRATION Installation Manual page 573

30.2.1 Advantages
The most important and most visible improvement brought by the new protocol is the
enormous expansion of the available address space. An IPv6 address is made up of 128
bit values instead of the traditional 32 bits. This provides for as many as several
quadrillion IP addresses.
However, IPv6 addresses are not only different from their predecessors with regard to
their length. They also have a different internal structure that may contain more specific
information about the systems and the networks to which they belong. More details
about this are found in Section 30.2.2, "Address Types and Structure" (page 556).
The following is a list of some other advantages of the new protocol:
Autoconfiguration
IPv6 makes the network "plug and play" capable, which means that a newly set up
system integrates into the (local) network without any manual configuration. The
new host uses its automatic configuration mechanism to derive its own address
from the information made available by the neighboring routers, relying on a pro-
tocol called the neighbor discovery (ND) protocol. This method does not require
any intervention on the administrator's part and there is no need to maintain a central
server for address allocation—an additional advantage over IPv4, where automatic
address allocation requires a DHCP server.
Mobility
IPv6 makes it possible to assign several addresses to one network interface at the
same time. This allows users to access several networks easily, something that
could be compared with the international roaming services offered by mobile phone
companies: when you take your mobile phone abroad, the phone automatically
logs in to a foreign service as soon as it enters the corresponding area, so you can
be reached under the same number everywhere and are able to place an outgoing
call just like in your home area.
Secure Communication
With IPv4, network security is an add-on function. IPv6 includes IPsec as one of
its core features, allowing systems to communicate over a secure tunnel to avoid
eavesdropping by outsiders on the Internet.
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