9.2.1.1.1. IPv6 Addresses
An IPv4 address is 32 bits long and typically represented as 4 octets, for example
192.168.0.1. An IPv6 address is 128 bits long and is made up of a subnet prefix (n bits
long) and an interface ID (128 - n bits long).
An IPv6 address and its associated subnet is typically represented by the notation ipv6-
address/prefix-length, where:
•
ipv6-address is an IPv6 address represented in any of the notations described below.
•
prefix-length is a decimal value specifying how many of the leftmost contiguous bits
of the address make up the prefix.
The IPv6 address notation mirrors the way subnets are represented in the IPv4 Classless
Inter-Domain Routing (CIDR) notation.
9.2.1.1.2. IPv6 Address notation
An nShield Connect will accept an IPv6 address if it is entered in one of the forms shown
below and if the address is valid for context in which it is used. There are two
conventional forms for representing IPv6 addresses as text strings:
•
The long representation is x:x:x:x:x:x:x:x, where each x is a field containing
hexadecimal characters (0 to ffff) for each 16 bits of the address.
For example:
1234:2345:3456:4567:5678:6789:789a:89ab
1234:5678:0:0:0:0:9abc:abcd/64
•
If one or more consecutive fields are 0 then they can be replaced by ::.
For example:
1234:5678:0:0:0:0:9abc:abcd/64 can be written as 1234:5678::9abc:abcd/64
:: can only appear once in an IPv6 address.
Unless the address is a link-local address, the nShield Connect front panel only allows
lower-case letters in an IPv6 address.
IPv6 addresses keyed manually on the nShield Connect front panel are validated on entry
by the nShield Connect. As well as checking that the format of the address is correct, the
nShield Connect also validates that the address entered is valid for the context in which
it will be used, see Acceptable IPv6 Address by Use Case.
If Stateless Address Auto Configuration (SLAAC) is enabled the nShield Connect will
nShield® Connect Installation Guide 28 of 73
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