Information Technology Reference
In-Depth Information
It's a good idea to pick a sensible name for your scopes so that other
administrators will be able to figure out what the scope is used for.
Scope Prefix
The Scope Prefix page (see Figure 2.28) gets you started creating the IPv6 scope. IPv6 has
three types of addresses, which can be categorized by type and scope.
figure 2.28
Scope Prefix page of the New Scope Wizard
Unicast Addresses
One-to-one.
A packet from one host is delivered to another host. The
following are some examples of IPv6 unicast:
■
The unicast prefix for site-local addresses is FEC0::/48.
■
The unicast prefix for link-local addresses is FE80::/64.
The 6to4 address allows communication between two hosts running both IPv4 and IPv6.
The way to calculate the 6to4 address is by combining the global prefix 2002::/16 with the
32 bits of a public IPv4 address of the host. This gives you a 48-bit prefix. 6to4 is described
in RFC 3056.
Multicast addresses
One-to-many.
A packet from one host is delivered to multiple hosts
(but not everyone). The prefix for multicast addresses is FF00::/8.
Anycast addresses
A packet from one host is delivered to the nearest of multiple hosts (in
terms of routing distance).
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