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Galaxy Web GUI User Reference Manual

5-4 Communications (Including IP Settings)

The Prefix Length field

The prefix length is part of the manual setting. An IPv6 network is a

contiguous group of IPv6 addresses. The size of this field must be a

power of 2. The Prefix Length designates the number of bits for the

first 64 bits of the Ipv6 addresses, which are identical for all hosts in a

given network, and are called the network's address prefix.

The architecture of IPv6 address is shown below:

Figure 5-2: Basic IPv6 Address Format

Such consecutive bits in IPv6 addresses are written using the same

notation previously developed for IPv4 Classless Inter-Domain

Routing (CIDR). CIDR notation designates a leading set of bits by

appending the size (in decimal) of that bit block (prefix) to the

address, separated by a forward slash character (/), e.g.,

2001:0db8:1034::5678:90AB:CDEF:5432/48. (On the RAIDWatch

screen, slash is not necessary. The prefix number is entered in the

length field.)

The first 48 bits contain the site prefix, while the next 16 bits provide

subnet information. An IPv6 address prefix is a combination of an

IPv6 prefix (address) and a prefix length. The prefix takes the form

of “ipv6-prefix/prefix-length” and represents a block of address space

(or a network). The ipv6-prefix variable follows general IPv6

addressing rules (see RFC 2373 for details).

For example, an IPv6 network can be denoted by the first address in

the network and the number of bits of the prefix, such as

2001:0db8:1234::/48. With the /48 prefix, the network starts at

address 2001:0db8:1234:0000:0000:0000:0000:0000 and ends at

2001:0db8:1234:ffff:ffff:ffff:ffff:ffff.

Individual addresses are often also written in CIDR notation to

indicate the routing behavior of the network they belong to. For

example, the address 2001:db8:a::123/128 indicates a single

interface route for this address, whereas 2001:db8:a::123/32 may

indicate a different routing environment.

IPv6 Prefix Description

2001:410:0:1::45FF/128

A subnet with only one Ipv6

address

2001:410:0:1::/64

A subnet that contains 2

nodes. Often the default prefix

length for a subnet.

2001:410:0::/48

A subnet that contains 2

nodes. Often the default prefix

length for a site.

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 123 124

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