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According to RFC 2373, anycast addresses are used only as destination addresses and are
assigned only to routers. Anycast addresses are assigned out of the unicast address space
and the scope of an anycast address is the scope of the type of unicast address from which
the anycast address is assigned. A unicast address cannot be the same as the anycast
address.
2.4.3.3 IPv6
Autoconfiguration
In IPv4,
IP addresses are assigned
manually or automatically
by
DHCP server.
In IPv6,
there
is a more convenient way of handling this. Imagine if you have 128 bits of choices
to choose from, and assign those addresses to hosts in a network.
This can be very
frustrating.
IPv6 has a utility called autoconfiguration. What this means is that the IP address doesn’t
have to assign
manually, and the system administrator also do
not
need a server
to setup
the IP address. There are two types of autoconfiguration in IPv6:
•
Stateful autoconfiguration
--
It is similar to DHCP
in IPv4.
Presumably,
it
is
called DHCPv6
in IPv6.
•
Stateless
autoconfiguration
--
With stateless configuration, IPv6
hosts do
not
need to configure anything to get information from the router.
Some
configuration might still have to be done on the server (very minimal
configuration), but there
is
no
need
to configure any DHCP server.
In
stateless configuration,
hosts depend on
Router
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messages that
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