48
IPv6: The New Internet Protocol
IPv6 Addresses from the Internet Service Provider
When an Internet Service Provider assigns IPv6 addresses, it
assigns an entire subnetwork to the end customer. The net-
work address of the subnetwork is called the prefix. The sub-
network must allow for at least 2
64
IPv6 addresses. This
means that the assigned prefix can be no longer than 64 bits.
For a prefix length of 64 bits, the remaining 64 bits remain
available for what is known as the interface identifier. The
prefix and the interface identifier combine to form the IPv6
address.
The assignment of the prefix is called prefix delegation and is
part of DHCPv6.
The prefix assigned by the Internet Service Provider can be
shorter than 64 bits, thereby increasing the size of the sub-
network. For a prefix length of 56 bits, for example, the inter-
face identifier would increase to 72 bits. This means that 2
72
IPv6 addresses are available. In this case the FRITZ!Box in the
local network distributes the first or second subnetwork, with
a prefix length of 64 bits, so that the interface identifier of the
distributed IPv6 addresses is also 64 bits long.
Assigning IPv6 Addresses in the Local Network
The assignment of IPv6 addresses at a network interface us-
ing the SLAAC (Stateless Address Autoconfiguration) method
is completely automated and independent. Neither a manual
IP assignment nor configuration and maintenance of a central
service is required for IP assignments. The only requirement
is that the terminal device must be connected to the network
and started, so that it can automatically integrate itself into
the IPv6 network structure.
IPv6 Addresses without an Internet Connection
If there is no Internet connection, the globally valid prefix as-
signed by the Internet Service Provider does not exist. In this
case the FRITZ!Box can generate what are known as ULAs
(Unique Local Addresses) and distribute them in the local
network.
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Summary of Contents for FRITZ!Box 6320 Cable
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