Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 481
Addressing, Link-local Addresses, Static and Dynamic Addressing
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Addressing IPv6 addresses are normally written as eight groups of four hexadecimal digits, where each group is separated by a colon (:). For example, 2001:0db8:0000:0000:0000:0000:1428:57ab is a valid IPv6 address. If one or more four-digit group(s) is 0000, the zeros may be omitted and replaced with two colons(::). For example, 2001:0db8:0000:0000:0000:0000:1428:57ab can be shortened to 2001:0db8::1428:57ab. Only one set of double colons is supported in a single address. Any number of consecutive 0000 groups may be reduced to two colons, as long as there is only one double colon used in an address. Leading zeros in a group can also be omitted (as in ::1 for localhost). All the addresses in the following list are all valid and equivalent. • 2001:0db8:0000:0000:0000:0000:1428:57ab • 2001:0db8:0000:0000:0000::1428:57ab • 2001:0db8:0:0:0:0:1428:57ab • 2001:0db8:0:0::1428:57ab • 2001:0db8::1428:57ab • 2001:db8::1428:57ab IPv6 networks are written using Classless Inter-Domain Routing (CIDR) notation. An IPv6 network (or subnet) is a contiguous group of IPv6 addresses the size of which must be a power of two; the initial bits of addresses, which are identical for all hosts in the network, are called the network's prefix. A network is denoted by the first address in the network and the size in bits of the prefix (in decimal), separated with a slash. Since a single host is seen as a network with a 128-bit prefix, host addresses may be written with a following /128. For example, 2001:0db8:1234::/48 stands for the network with addresses 2001:0db8:1234:0000:0000:0000:0000:0000 through 2001:0db8:1234:ffff:ffff:ffff:ffff:ffff Link-local Addresses Link-local addresses, starting with fe80:, are assigned only in the local link area. The addresses are generated usually automatically by the operating system's IP layer for each network interface. This provides instant automatic network connectivity for any IPv6 host and means that if several hosts connect to a common hub or switch, they have an instant communication path via their link-local IPv6 address. . Link-local addresses cannot be routed to the public Internet. Static and Dynamic Addressing Static IP addresses are manually assigned to a computer by an administrator. Dynamic IP addresses are assigned either randomly or by a server using Dynamic Host Configuration Protocol (DHCP). Even though IP addresses assigned using DHCP may stay the same for long periods of time, they can change. In some cases, a network administrator may implement dynamically assigned static IP addresses. In this case, a IPv6 Addressing | 481
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