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The network prefix (the routing prefix combined with the subnet ID) is contained in the most significant 64 bits of the address. The size of the routing prefix may vary; a larger prefix size means a smaller subnet ID size. The bits of the subnet ID field are available to the network administrator to define subnets within the given network.
As fc00:: / 7 ULAs are not meant to be routed outside their administrative domain (site or organization), administrators of interconnecting networks normally do not need to worry about the uniqueness of ULA prefixes. However, if networks require routing ULAs between each other in the event of a merger, for example, the risk of address collision ...
The address is formed from its routing prefix and a unique identifier for the network interface. Through NDP routing prefix advertisements, a router or server host may announce configuration information to all link-attached interfaces which causes additional IP address assignment on the receiving interfaces for local or global routing purposes.
Unicast address assignments by a local Internet registry for IPv6 have at least a 64-bit routing prefix, yielding the smallest subnet size available in IPv6 (also 64 bits). With such an assignment it is possible to embed the unicast address prefix into the IPv6 multicast address format, while still providing a 32-bit block, the least ...
Just as IPv4 reserves addresses for private networks, blocks of addresses are set aside in IPv6. In IPv6, these are referred to as unique local addresses (ULAs). The routing prefix fc00:: / 7 is reserved for this block, [9] which is divided into two / 8 blocks with different implied policies.
Since it would not be practical to manually provision networks at scale, in IPv6 networking, DHCPv6 prefix delegation (RFC 3633; RFC 8415 § 6.3) is used to assign a network address prefix and automate configuration and provisioning of the public routable addresses for the network. In the typical case of a home network, for example, the home ...
The Dynamic Host Configuration Protocol version 6 (DHCPv6) is a network protocol for configuring Internet Protocol version 6 (IPv6) hosts with IP addresses, IP prefixes, default route, local segment MTU, and other configuration data required to operate in an IPv6 network.
A global view into the history of the growing IPv6 routing tables can be obtained with the SixXS Ghost Route Hunter. [8] This tool provided a list of all allocated IPv6 prefixes until 2014 and marks with colors the ones that were actually being announced into the Internet BGP tables.